Emulators for Android

iNES  |  MasterGear  |  Speccy  |  fMSX  |  ColEm  |  AlmostTI  |  VGB  |  VGBA
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by Marat Fayzullin

Nintendo Entertainment System, Famicom, GameBoy, Super GameBoy, GameBoy Color, GameBoy Advance, Pocket Printer, GameLink, and DiskSystem are trademarks of Nintendo. SEGA SG1000, SC3000, SF7000, Master System, and GameGear are trademarks of SEGA. While programs presented at this site attempt to create "compatible" environment for the gaming software, they are not equivalent to the original hardware.

Emulators are programs that run software written for old computers or videogame consoles on the new hardware. Essentially, an emulator makes old software "think" that it is running on the original hardware, while it actually runs on your computer. I am creating emulators since 1993 and have made quite a few of them. For those who would like to try making an emulator on their own but do not know where to start, I have written a short introduction into the craft.

Originally, I developed emulators for PCs and Unix workstations. Once the mobile devices, such as cell phones and tablets, became capable of emulating older hardware, I started porting my emulators to these devices. Thus, at this page you will find my applications for Android-based phones and tablets, as well as some useful tips on setting them up.

If you work for a game company that would like to run its legacy games on mobile phones or other hardware, and need help, contact me.


Optimized for Android
Emulation and screen rendering are heavily optimized for Android platform using hand-written ARM assembly and OpenGLES.
The fast-forwarding feature lets you quickly skip through long dialogs and demo sequences.
Joystick Emulation
The joystick is emulated with hardware keys, virtual joypad, or accelerometer. Sony Xperia Play, Nyko, MOGA, iCade, and Sixaxis controllers also supported.
The gameplay can be saved at any moment and restored to the same point later. Emulators will also save state on exit, letting you restart where you have left off.
Mouse Emulation
For the old software that requires a mouse, it is emulated with the touch screen.
Recording Music
The soundtrack can be saved to a MIDI file to be played back later or used as a ringtone.
Compressed Files
The emulators will automatically process files with .zip (WinZIP) and .gz (GZIP) extensions. You do not need to unpack these files.
Built-in Debugger
Many emulators include a built-in debugger for hacking or developing your own retro software.
Cheatopedia offers hundreds of cheats for popular games, or you can enter your own cheat codes.
The emulators will save stamp-sized screenshots for each game you play, and show them in the file selection dialog.
State Exchange
State Exchange lets you swap gameplay states with other users playing the same game.
Network Play
The NetPlay feature lets you play with other users over local network or Internet.
Normal Display
The picture fills the center of your device screen, while retaining the original display ratio.
Stretched Display
The picture is stretched horizontally to fill the entire device screen, for the biggest possible size.
Softened Display
The picture is softened, hiding individual pixels, as if it were shown on an old analog TV.
TV Scanlines
Horizontal raster lines are added, simulating analog TV interlace effect.
Keyboard Emulation
The keyboard is naturally emulated with the hardware keyboard or the on-screen virtual keyboard, in case your Android device lacks a real one.
Frame Rate Display
The frame rate counter shows how fast your emulation is running. The ideal rates are 60Hz for NTSC video and 50Hz for PAL video.


6 December 2018

fMSX Deluxe MSX home computer emulator just went on sale for $1.99 at Google Play.

2 December 2018

VGB, my GameBoy Color, GameBoy Classic, and Super GameBoy emulator for Android, is now on sale for $1.99 at Google Play.

30 November 2018

MasterGear is currently on $2.99 sale at the Google Play. It emulates Sega MasterSystem, GameGear, SG-1000, SC-3000, and SF-7000 consoles and home computers.

27 November 2018

VGB 5.5.5, a new version of my universal GameBoy Color, GameBoy Classic, and Super GameBoy emulator, is now available from Google Play. In this release, I have added an option to hide system files created when copying data from MacOS. You can also force the app to save all its files (save states, screenshots, etc) in a separate folder on the internal storage. If you are looking for GameBoy Advance emulation, my GBA/GBC emulator, VGBAnext is currently on $2.99 sale.

26 November 2018

A new Speccy 5.0.4 release for Android is now available, with Speccy Deluxe still on sale for $1.99 for the next couple of days. In this release, I've addressed a few user requests. Speccy can now be forced to save all its files (state saves, screenshots, etc) to the application folder in internal storage. Previously, this only happened if the original folder with the Spectrum software was not writable. Also, you can tell Speccy to hide dot-files created when transferring MacOS content to an Android device.

24 November 2018

It is a bit past black Friday, but better late than never. VGBAnext is now on $2.99 sale. Get it while the sale lasts.

22 November 2018

VGBAnext 5.9.11 is now online, with Cheatopedia cheats for 16 more games. The new release adds cheats for four more Hot Wheels titles, two Hugo games, Hamtaro, and Duel Masters, among others. In related news, my iNES emulator is on $2.99 sale for the last day today. Speccy Deluxe, my Sinclair ZX Spectrum emulator, is on $1.99 sale for the next few days.

20 November 2018

Speccy Deluxe, my Sinclair ZX Spectrum emulator, is currently on $1.99 sale. In addition to all the standard features found in the free version of Speccy, you get multiple save slots, advanced settings menu, and other features.

19 November 2018

MasterGear 4.2.7 is now available from Google Play. Among other things, this release makes it possible to assign volume controls and other special keys to gamepad buttons. I have also fixed a bug where the action bar would stay on screen after adding a Cheat Hunter watch.

15 November 2018

ColEm 4.6.4 is now available on Google Play. Starting with this release, you can assign volume controls and other special keys to gamepad buttons. I also added support for diagonal directional keys Android defines since Nougat. A bunch of other button assignment issues have been fixed. Finally, I have fixed the bug where the action bar would get "stuck" after adding a Cheat Hunter watch. In somewhat related news, iNES is currently on sale for $2.99.

14 November 2018

fMSX 5.5.3, released today, enables volume controls and other hardware keys to be assigned to gamepad buttons. The entire key assignment UI has been refactored and several bugs fixed there. I also corrected a Cheat Hunter issue, where action bar would not disappear after adding a watch. Finally, the problem running the free version of fMSX when fMSX Deluxe is also installed has been fixed.

13 November 2018

I've published iNES 5.4.4 this morning, a new release of my NES and Famicom emulator. This release allows to assign media keys (such as volume controls) and other special keys to joystick buttons. I have completely refactored key assignment code, fixing several bugs and adding support for diagonal keypad buttons introduced in Android Nougat. Also, a minor Cheat Hunter bug, where the action bar would not disappear after adding a watch, has been fixed. In other news, there is a minor bugfix release of VGB 5.5.4 today.

12 November 2018

A couple of quick bugfix releases of VGBAnext 5.9.10 and Speccy 5.0.3 today. These new packages fix a problem where the app would not open files with certain names, and the desktop shortcuts to these files would not work either. I have also corrected running files from the Gallery and made a quick fix to the Cheat Hunter dialog, where the action bar would get stuck after adding a watch. Please, update immediately as these updates become available from Google Play. Also, my ColEm Deluxe and AlmostTI emulators are currently on sale for $1.99 and $2.99 respectively.

10 November 2018

My AlmostTI graphing calc emulator is currently on sale for $2.99. This is the easiest way to get a TI-83, TI-84, and a bunch of other Texas Instruments calculators inside your Android phone. You will still need a ROM file dumped from the original Texas Instruments product you own though.

8 November 2018

Just published VGBAnext 5.9.9 emulator. This release completely refactors the key mapping code, letting you use volume controls and other special keys as gamepad buttons. I have also added support for diagonal keypad buttons, introduced since Android Nougat. Finally, there are cheats for five more GBA games, including Golden Nugget, Godzilla, and Gremlins. Finally, the complete version of my ColecoVision emulator, ColEm Deluxe, is still on $1.99 sale.

7 November 2018

This week's VGB 5.5.3, release makes special hardware keys (such as volume controls) usable as gamepad buttons, when assigned. I have also refactored the key mapping dialog, fixed a few bugs, and added support for diagonal keypad keys Android introduced since SDK v24.

6 November 2018

ColEm Deluxe is currently on $1.99 sale at Google Play. The Deluxe version adds multiple saves, advanced settings, and other features not found in the free version.

5 November 2018

Speccy 5.0.2 enables assigning hardware keys to joystick functions, fixes overall key assignment functionality, and also corrects a crash starting a game from Speccy when both the free and the Deluxe versions are installed. Since key mapping code has been completely redesigned, there may be a few new bugs. If you encounter any issues assigning the keys, please, let me know as soon as possible.

1 November 2018

This week's MasterGear 4.2.6 release for Android fixes a stray crash and a few problems with the MIDI recording. Also, fMSX Deluxe is still on sale for $1.99 at Google Play.

31 October 2018

VGBAnext 5.9.8, a new version of my universal GameBoy Advance, GameBoy Color, and GameBoy Classic emulator for Android, is now online. This version fixes a crash when trying to share information about the app and adds Cheatopedia entries for eight more GBA games, including Garfield, Freekstyle, Gekido, Flushed Away, and Game & Watch Gallery.

30 October 2018

fMSX Deluxe is currently on sale for $1.99 at Google Play. The deluxe version adds multiple state saves, advanced settings, and other features not found in the free version.

29 October 2018

ColEm 4.6.3 is now on Google Play and available for download. Starting with this version, all input devices will be assigned to the first player by default. This should fix problems with the main gamepad being automatically assigned to the second player. The second player input assignment is now made manually, using the "Settings | Input | Select Second Player" option. I have also fixed analog sticks handling and a stray crash when sharing the app info.

26 October 2018

VGB, my GameBoy Color, GameBoy Classic, and Super GameBoy emulator for Android, is currently on sale for $1.99 at Google Play. Get it while it's cheap!

25 October 2018

fMSX 5.5.2 makes several changes to the PSG sound chip emulation and fixes drum track in the MIDI recording. Also, all input devices will now be assigned to the first player by default. This should fix problems some AndroidTV users were having. If you would like to assign a gamepad to the second player, use the "Settings | Input | Select Second Player" option.

24 October 2018

iNES 5.4.3 improves experience for AndroidTV users and others with multiple input devices. All these devices will now start as player 1 by default. Use the "Settings | Input | Select Second Player" option to assign the device you would like to use for the second player. I have also fixed some problems with analog joysticks.

22 October 2018

This week's Speccy 5.0.1 release for Android fixes several problems with the sound and makes life easier for many AndroidTV users. Starting with this release, you can select the second player's input device via "Settings | Input | Select Second Player" option. This should help everyone with multiple input devices, especially AndroidTV users, since it lets them avoid using the tiny remote control as first player's input device. The support for analog sticks also improved. In the PSG sound emulation, the frequency and volume of each channel is now computed immediately before playing the sound. This fixes situation when the sound does not come out after loading a .Z80 file, until loaded program changes a PSG channel. It also fixes the soundtrack in some games, such as Auf Widersehen Monty. A few other things have also been fixed. Also, VGBAnext, and MasterGear emulators are on $2.99 sale at the moment.

18 October 2018

VGB 5.5.2, published this morning, fixes a bunch of gamepad issues, making life easier for AndroidTV users, people with multiple gamepads, and analog sticks. I have also fixed another crash and made some changes to UI skinning. Settings screens no longer have skinned backgrounds, since Android does not support them very well.

17 October 2018

VGBAnext 5.9.7, a new release of my universal GameBoy Advance and GameBoy Color emulator, is now online and on sale for $2.99. This release fixes several input device issues specific to people with multiple gamepads and analog sticks, including a lot of AndroidTV users. I have also fixed another crash source and disabled skinned backgrounds in the Settings. Android does not support skinned Preferences well.

15 October 2018

The new MasterGear 4.2.5 adds an option to choose the input device (gamepad or joystick) to be used for the second player. By default, the app will start up with all the input devices assigned to the first player, solving the problems some AndroidTV users have been having. To enable the second player, use the "Settings | Input | Select Second Player" option. There is also a better routine for analog sticks detection, so some previously non-working analog inputs should work. Finally, my Sinclair ZX Spectrum emulator, Speccy Deluxe, is currently on $1.99 sale. The latest Speccy adds cheats for 3300+ Spectrum games.

11 October 2018

ColEm 4.6.2, released today, fixes skins in the Cheat Editor and also removes skins from the Settings. I have found that Android does not really support skinning preference screens, so no matter what I do they look ugly. Also, Speccy Deluxe is currently on $1.99 sale. Finally, iNES is going to be on $2.99 sale for a couple more days.

9 October 2018

Starting this week with a major Speccy 5.0 release. This release adds Cheatopedia containing POKEs for 3300+ ZX Spectrum games. Please note that the Cheatopedia feature is very experimental at the moment. Please, report any problems you encounter when using Cheatopedia. Also, two of my other emulators are on $2.99 sale this week: iNES and AlmostTI.

5 October 2018

My AlmostTI emulator is currently on $2.99 sale at Google Play. ColEm Deluxe is also on $1.99 sale, but that one is ending in a day or so.


System ROMs
If an emulator requires you to supply your own system ROMs, place them into /sdcard/AppName directory (such as /sdcard/Speccy) or directly into /sdcard directory.

To fast-forward gameplay, press and hold the on-screen FFWD button, if present. If you do not see the FFWD button, press and hold the Android SEARCH key. If your device lacks the SEARCH key, you can assign the fast-forwarding feature to a different hardware key in the Android "Settings" menu.

Built-in Menu
All emulators come with their own internal menus, offering wide variety of advanced hardware and emulation settings. The built-in menu shows up when you either press the on-screen MENU button or select "Advanced" from Android menu. You can navigate the built-in menu with the on-screen joystick or by touching menu items. To select a menu item, touch it, or press FIRE-A. To close the menu, touch outside the menu, or press FIRE-B. Remember, these are advanced settings, so be careful changing them.

Keyboard Emulation
If you need a keyboard to operate the emulator (such as fMSX), but your Android device does not have a physical keyboard, you can quickly toggle the virtual keyboard with the on-screen KEYS button. To permanently enable virtual keyboard, set "Virtual Keyboard" in the Android "Settings" menu. Notice that the modal keys (such as SHIFT, etc) can be found at the screen corners.

Network Play
In the emulators that support NetPlay feature, such as iNES or MasterGear, you can play with other users over local WiFi network or Internet. To establish connection, follow these steps:

  • Both players should be running the same game.
  • Both players should be on the same WiFi network or have externally visible IP addresses. NetPlay will not work through NAT.
  • The first player should check "NetPlay" in the menu and then choose "Become Server" option.
  • The second player should check "NetPlay" in the menu and then choose first player's name from the list of available servers.
  • Both emulators will now reset and start playing as if they were the same console with two gamepads.
  • Once you are done playing, uncheck "NetPlay" on both devices to disconnect NetPlay.

See below for FAQ and application-specific tips!


[#] Google Play Market

All my products are published on the Google Play Market. Please, do not forget to vote!

[#] EMUL8 Discussion Group

Report and discuss your problems here. You may need to create a Google account to post to this group, but you do not have to become a member.

[#] iNES for Android

iNES emulates classic NES and Famicom videogame consoles from Nintendo. It plays NES, Famicom, DiskSystem, and VS System games on your Android phone or tablet. Save game at any time and restart from that point later. You can also use GameGenie cheat codes, make screenshots and save game music in MIDI format. More...

  • Network play support
    Since Dec 4 2012, iNES supports playing over local network or Internet with other iNES users. You both have to be playing the same game and be on the same WiFi network, or have Internet-visible IP addresses.
[#] MasterGear for Android

The MasterGear emulates several 8bit videogame consoles from SEGA. It plays Master System, GameGear, Mark 2, Mark 3, SG1000, SC3000, and SF7000 games on your Android phone or target. You can save game at any time and restart from that point if you get killed, make screenshots, and even save game music in MIDI format to play it later. More...

  • Network play support
    Since Dec 7 2012, MasterGear supports playing over local network or Internet with other MasterGear users. You both have to be playing the same game and be on the same WiFi network, or have Internet-visible IP addresses.
[#] Speccy for Android (also see free version)

Speccy emulates 16kB, 48kB, and 128kB versions of Sinclair ZX Spectrum, as well as Spectrum +2, +2A, and +3, as well as Timex Sinclair models. Although I had done some ZX-related work in the past, for many years I abstained from writing a Sinclair ZX Spectrum emulator, because there were so many other Spectrum emulators around. On the other hand, it felt like a gaping hole on my resume. So, here it is, yet another Spectrum emulator, trivially named Speccy. More...

  • To change joystick type or enable mouse
    Go to the built-in menu, select "Input devices" and set whatever input device(s) you want.
  • 128k Spectrum bootup menu
    This menu can be operated with the on-screen arrow buttons, while holding CSHIFT. Believe it or not, but that is how original 128k Spectrum did it.
  • To load program from a tape (i.e. .tap or .tzx file)
    1. Select "Tape Loader" from the 128k Spectrum bootup menu or type LOAD "" (SSHIFT + J, P, P, ENTER) on 48k Spectrum to start the tape loader.
    2. Press the on-screen MENU button to go to the built-in menu and toggle the "Tape running" option to start the tape. There are also options to rewind and browse tape contents.
    3. Wait for the program to load, which may take a while, just like on a real ZX Spectrum. You can speed things up by holding the Android SEARCH key: it fast-forwards the emulation.
[#] fMSX for Android (also see free version)

fMSX emulates the popular MSX home computer from the 1980s, its MSX2 and MSX2+ upgrades, and many add-ons. fMSX is the first emulator I wrote and one of the first MSX emulators from which many others have been derived. Run your old MSX programs from disks or game cartridges on your Android phone or tablet. More...

  • To enable mouse or joystick
    Go to the built-in menu, select "Input devices" and set mouse or joystick in joystick port #1. Same goes for the second joystick port.
[#] ColEm for Android (also see free version)

While developing fMSX, I got a request to take a look at the ColecoVision videogame console. The request contained a short document on the ColecoVision internals, from which I found that ColecoVision was not much different from MSX. Thus, I got to work and in a short while made a ColecoVision emulator, later known as ColEm. More...

[#] AlmostTI for Android

AlmostTI emulates a big family of programmable graphing calculators from Texas Instruments, including TI-85, TI-86, TI-81, TI-82, TI-73, TI-83, TI-83+, TI-83+ SE, TI-84+, and TI-84+ SE. Pretty much every Z80-based TI calculator is covered. Please note that in order to run AlmostTI, you will need the system firmware ROM. See instructions on how to obtain that ROM from your own calculator. More...

  • Getting ROMs
    In order to use AlmostTI, you need at least one calculator ROM. AlmostTI comes without ROMs, as they are intellectual property of Texas Instruments. But you can dump ROM from a TI calculator you own, by following these simple instructions.
  • Naming ROMs
    On startup, AlmostTI will look for the following files in your internal storage (usually "/sdcard"):

    TI85.ROM, TI86.ROM, TI81.ROM, TI82.ROM, TI73.ROM, TI83.ROM, TI83P.ROM, TI83SE.ROM, TI84P.ROM, TI84SE.ROM, TI-85.ROM, TI-86.ROM, TI-81.ROM, TI-82.ROM, TI-73.ROM, TI-83.ROM, TI-83P.ROM, TI-83SE.ROM, TI-84P.ROM, TI-84SE.ROM

    The names can be in upper or lower case. You can always repeat the search by clicking on the "Scan Files" menu option or the magnifier icon in the action bar.
[#] VGB for Android

VGB emulates Nintendo GameBoy handhelds and their accessories. It plays GameBoy, GameBoy Pocket, GameBoy Color, and Super GameBoy games on your Android phone or tablet. VGB also supports the Pocket Printer, GameGenie cheat codes, and more. Please notice that VGB will not play GameBoy Advance games: you will need VGBA for that. More...

  • GameLink support
    As of Dec 17 2012, VGB supports GameLink emulation over a local network or the Internet. To establish connection, check "NetPlay" in the Android menu. Note that both of your devices have to have valid IP addresses. This feature will not work if one of you is behind NAT.
  • RumblePak support
    As of Mar 11 2012, VGB supports RumblePak emulation using your device's built-in vibration. Your phone will vibrate every time a game uses the "rumble" feature.
[#] VGBA for Android

VGBA emulates the Nintendo GameBoy Advance handheld. It plays GameBoy Advance games on your Android phone or tablet. Please notice that VGBA will not play classic GameBoy games: you will need VGB for that. More...

  • GameLink support
    As of Jun 13 2012, VGBA supports GameLink multiplayer emulation over a local network or the Internet. To establish connection, check "NetPlay" int the Android menu. Note that both of your devices have to have valid IP addresses. This feature will not work if one of you is behind NAT.
  • VGBA does not require GBA BIOS file
    It emulates GBA BIOS internally instead.
  • VGBA supports light sensor, tilt sensor, and RumblePak
    You can find these features used in such games as Boktai, Boktai 2, Warioware Twisted, and Drill Dozer.
  • If you are having trouble saving games
    Use the gameplay freezing feature instead. Press the Android MENU key and select "Freeze/Restore" to save your game. Later on, select the same option to restore your game back to where you have frozen it. Having said that, I would still appreciate a bug report for any game that fails saving/restoring state on its own.
  • If you are still having trouble saving games
    If you cannot save games, even with the freezing feature, and the games won't even save state when you exit and restart VGBA, you may be low on the disk space. Check how much free space you have got in the folder where your games are. There should be at least 512kB of free space for saving and freezing to work.
  • If nothing works, games do not save, cheats do not work
    Aside from using a pirated version (that is known to fail randomly, on different features) and low disk space, this problem may sometimes be caused by a package upgrade. You can fix it by completely removing VGBA from your device, then reinstalling it from the Google Play.
  • Exporting .SAV files to other emulators
    VGBA will automatically load in-game saves (.SAV) made by other emulators. As of August 7 2014, VGBA will also store in-game saves in a format compatible with other emulators. Prior VGBA versions used their own .SAV format but offered an option to export VBA-compatible .SAV files.
  • Exporting .STA/.FRZ files to other emulators
    Unfortunately, the gameplay state files are in proprietary format and cannot be exported to other emulators. Nor can VGBA load proprietary state files (such as .SGM) from other emulators.

Frequently Asked Questions





Network Play



  1. I want to report a bug or make a suggestion!

    The best ways to get help are by reporting your problem on the forum or by emailing me directly. Due to the large number of requests and limited time, I can't handhold you or help you learn how to use my apps. I can only help you if you have found a geniune bug and can explain what it is in clear terms. Generally, it takes a week or two to resolve most issues, unless I am sick, busy, or you are asking about something way over my head.

    Also note that reporting problems in a Google Play review is not very helpful, as it makes more difficult for me to respond to your complaint and clarify what the problem is. Adding negative rating to your Google Play feedback makes it almost certain that I will not waste my time trying to help you. Thus, start by using the forum or emailing me to get help.

    To make my job easier, make sure you...

  2. I want games! I need games! Where do I find games?

    You can find a huge collection of public domain games for old game consoles at the PD ROMs web site. For both legal and ethical reasons, I cannot and will not tell you where to download commercial games for running them with my emulators, even if you email me about it. If you really need to, use an Internet search engine instead. Please, do not download and run any software that you do not already own (i.e. legally bought a cartridge with the same game). It is the right thing to do.

  3. Nothing works, saves fail, everything hangs or crashes!

    Aside from using a pirated version (that is known to fail randomly, on different features) and low disk space, this problem may sometimes be caused by a package upgrade. You can fix it by completely removing emulator from your device, then reinstalling it from the Google Play.

  4. I have bought the app, but now it says I do not have a valid license!

    To protect against piracy, I had to introduce the Google Play license check into commercial versions of my Android apps. Every now and then, the license check will use the Google Play Store app on your device to see if you have actually bought my app. This operation is completely transparent to the user, unless it fails. My statistics show that license checks fail for about 3% of people. In order to stay in the other 97%, make sure that

  5. I cannot save games and screenshots do not show up either.

    The two most common reasons are lack of free disk space and active USB connection to a computer that locks your storage from changes. Also, starting with Android 3.2+, Google essentially disabled writing to the external SD card. This means that if you place emulator files to the external SD card, emulators may not be able to save game states or screenshots. If you encounter this problem with your device, avoid it by always placing files to the internal SD card.

  6. Do your emulators work on rooted devices?

    All my applications run normally on rooted devices. There is a catch though. If you have a rooted device with LuckyPatcher or some other cracking tool installed, my products will not run on your device. You always have a choice of removing the pirate tools: once they are gone, my applications will run, whether your device is rooted or not.

  7. Emulator is too slow. How do I make it faster?

    First of all, my emulators will always try to mimic the actual hardware speed. You can easily verify that by enabling the "Video | Show Frame Rate" option and noting the "fps" value at the top-left screen corner. As long as this value stays close to 60fps (50fps for PAL hardware like ZX Spectrum), your speed is just fine. If you still want emulation to run faster than that, disable the "Video | Sync Display" option and watch things take off.

    Let us now suppose that you are not getting the optimal speed. The emulation speed generally depends on your hardware, the other software you are running, and your emulation settings. Follow these simple steps to improve the speed:

  8. How can I make fast-forward stay on all the time?

    To make FFWD button a toggle switch, enable "General | Persistent Fast-Forward" option. Please note that if you are trying to play games with fast-forwarding always on, you may be better off following performance improvement advice instead.

  9. How do I remove the title bar from the top of my screen?

    To quickly toggle the title bar, place your finger at the middle of the screen and flick it up to the top to hide the the bar. To make the title bar reappear, flick your finger down from the top of the screen. You can also choose to hide the title bar on startup, by enabling the "General | Hide Title Bar" option. This will also hide the menu though. To get the menu back, flick your finger down the screen.

  10. When I rotate my Gingerbread device, the picture disappears!

    There appears to be a bug in Android 2.x (Gingebread) that breaks OpenGLES views when you rotate the device. Starting from August 2013, all my emulators come with a workaround for this bug. So, if you are experiencing this problem, head to Google Play and download the latest version of my app.

  11. When I use video acceleration, the picture becomes fuzzy.

    When scaling pictures, the OpenGLES hardware always adds a bit of blur, to avoid ugly scaling artifacts. If you do not like the fuzzy picture, disable the "Video | Hardware Video Acceleration" option for the crystal clear image, at the cost of lower performance and shorter battery life.

  12. The picture does not fill the screen.

    When not using hardware video acceleration, the emulator will scale picture with the highly optimized assembler code running on your main CPU. This code is tailored for several different screen resolutions. The emulator will choose the resolution that best matches your screen, but may not completely fill it. If you would like the picture to fill your whole screen, enable the "Video | Hardware Video Acceleration" option.

  13. Colors look wrong. I want to change them.

    Several emulators, such as iNES and VGB, let you change the color palette to the one you like. In order to make a custom color palette for a game named Game.nes or, create a text file named Game.pal with 64 (for iNES) or 16 (for VGB) color definitions in the RRGGBB format, one per line. If you want to have the same custom palette for all the games, place it into /sdcard/iNES/iNES.pal or /sdcard/VGB/VGB.pal instead. Here is a sample VGB palette file:

    FFFFFF ; Normal colors
    FFFFFF ; Background colors
    FFFFFF ; Sprite colors
    FFFFFF ; Window colors

  14. Sound lags. How do I prevent it from lagging?

    If you feel that the sound lags on your device (i.e. you hear shots a little bit after pressing the fire button), try decreasing the "Audio | Audio Latency" setting. Reducing it too much may cause sound distortions though, so be careful. If your audio becomes distorted, increase the latency. You may also want to try toggling the "Audio | Native Audio" option and see if it makes sound better.

  15. Sound clicks and pops. How do I clean it up?

    If you are hearing clicks and pops in the sound, increasing the "Audio | Audio Latency" setting should fix your problem, at the cost of some sound lag. If the sound issues persist, set "Video | Frames to Draw" setting to 35%, or enable "Video | Hardware Acceleration" option to speed up display updates. You may also want to try toggling the "Audio | Native Audio" option and see if it makes sound better.

  16. Sound repeats, like an echo. How do I fix it?

    The echo often occurs on slower devices, where emulation cannot keep up with the audio, so the audio repeats, while emulation catches up. You can avoid this problem by optimizing performance to make emulator run faster. If the sound still echoing, increase the "Audio | Audio Latency" setting. You may also want to try toggling the "Audio | Native Audio" option and see if it makes sound better.

  17. I cannot press more than two virtual buttons at once. How do I fix it?

    A lot of Android devices have limited multitouch that only lets you use two fingers. On these devices, you simply cannot press more than two virtual buttons at once. My emulators offer a workaround of sorts though. Go into the "Input | Edit Layout" setting and drag buttons so that they overlap a little bit. Now, you can press both buttons by touching the overlapped spot.

  18. Virtual joystick buttons are too small, too big, or awkwardly placed. How do I change them?

    To resize joystick buttons, open the "Input | Virtual Joystick Size" setting and choose any size you like. To move buttons, open the "Input | Edit Layout" setting and drag buttons around the screen to the most comfortable spots. Keep in mind that when you rotate your device, each button will "stick" to the closest screen edges.

  19. Virtual joystick buttons obscure my screen. Can I change them?

    Normally, you will see transparent controls overlaid on top of the display. To change their opacity or hide the controls altogether, use the "Input | Virtual Joystick Opacity" and the "Input | Virtual Joystick Shape" settings. You can also control the joystick by physically tilting your device, if your device has an accelerometer and you enable the "Input | Tilt Joystick" option.

  20. Can I set my own virtual joystick images?

    In my apps, released after August 14 2015, you can supply your own virtual joystick skin. Make a Controls.png file using the image at the right as your template, then stick it into the emulator-specific folder, like /sdcard/iNES or /sdcard/VGB. Then go into "Settings | Input | Edit Joystick Layout" and select "Custom Skin" as the joystick shape.

  21. Does joystick have auto-fire? How do I enable it?

    See the "Input | Auto Fire Settings" setting. It lets you choose what buttons are going to have auto-fire.

  22. Can I use my keyboard, gamepad, or Xperia Play keys?

    Of course you can use your generic keyboard, gamepad, or joystick with any of my emulators. If your gamepad has a mode switch, make sure it is set to the "generic gamepad" position. You may also want to visit the "Input | Assign Keys" setting in order to make a comfortable button layout for yourself. By default, your keys are going to be assigned as follows:

    EmulatorKeyboardGamepadXperia Play
    FIRE-LQ, E, T, U, OL1L
    FIRE-RW, R, Y, I, PR1R

  23. I have a PowerA MOGA controller. Will it work?

    Starting Feb 26 2013, all new releases of my emulators natively support MOGA gaming controller. Simply turn it on, and once you see the "MOGA controller connected" message on the screen, it is ready to play with. You can still use MOGA with older versions of my products with the help of the free universal MOGA driver available from Google Play. This little app should let you use the MOGA with many applications that do not normally support it.

  24. I have an iCade joystick. Will it work?

    Starting Apr 5 2013, all my emulators support iCade joysticks. To enable iCade support, toggle the "Input | iCade Support" option. You may also want to customize the button layout via the "Input | Assign Keys" setting.

  25. I have a Sony Sixaxis gamepad. Will it work?

    If you have got a Sony Sixaxis gamepad and a rooted Android device, you can use the gamepad over Bluetooth, with the help of the Sixaxis Controller app from Dancing Pixel. See the application web site for instructions.

  26. I have a Nintendo Wiimote controller. Will it work?

    For Nintendo Wiimote users, here is a short tutorial on using Wiimote with my applications, provided by Robert McCurdy.

  27. How do I use NetPlay?

    Most of my emulators now support the NetPlay feature that lets you play with other users over your local WiFi network or the Internet. To establish connection, follow these steps:

  28. I do not see the other player's device.

    In order to use network play, both players must be running the same game and have mutually visible IP addresses. It is only possible if

    You will not see each other in the NetPlay dialog, unless these conditions are met.

  29. What is GameLink and how is it different from NetPlay?

    Unlike stationary consoles which came with a pair of gamepads, the GameBoy and GameBoy Advance handhelds had a special serial cable that let users connect 2-4 handhelds together, for cooperative play. This cable is known as the GameLink and supported in my GameBoy emulators, VGBA and VGB. The GameLink connection works exactly the same way as a regular NetPlay connection.

  30. Why does emulator slow down when using NetPlay?

    When using NetPlay, each player must send a lot of data over the network and wait for the other player to acknowledge every packet they send. This wait time slows down the gameplay speed for both players. The wait is slightly worse for GameLink (in VGBA and VGB) because the data needs to be sent more often. While this slowdown is unavoidable and depends on your network speed, I am working to reduce it in the upcoming versions of my products.

  31. My cheats do not work.

    Many games are available in different versions, in different languages, or with bugfixes. In order for a cheat code to work, you need to be running exactly the same version of the game that this cheat code has been discovered for. The codes will not work for a different game version, even on the real GameShark or ActionReplay hardware. Besides, many cheat codes found on the Internet contain errors and will not work on any game version. Given how unreliable cheats are to begin with, I usually can't answer the question why your cheat does not work.

  32. I cannot enter any cheat codes. No matter what I do, they do not work.

    The easiest way to use cheat codes is by going to Android menu and choosing "Cheats | Cheatopedia" there. Cheatopedia contains premade cheats for many popular games.

    To enter cheats manually, go to the Android menu and choose "Cheats | Edit Cheat Codes". Use the cheat editing interface to add, delete, or edit cheat codes. The editor will not let you enter a code unless your code strictly follows one of the relevant formats:
    GBA ActionReplay or GameShark XXXXXXXX XXXXXXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    CodeBreaker or GameSharkSP XXXXXXXX XXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    GB/GBC GameGenie XXX-XXX-XXX "X" = digit from "0" to "9" or letter from "A" to "F".
    GameShark XXXXXXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    NES GameGenie XXXXXX or XXXXXXXX "X" = letter from "A" to "Z".
    ActionReplay XXXXXXXX "X" = digit from "0" to "9" or letter from "A" to "F", the first two digits are usually "00" or "01".
    SMS/GG GameGenie XXX-XXX or XXX-XXX-XXX "X" = digit from "0" to "9" or letter from "A" to "F".
    ActionReplay XXXX-XXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    CV Memory POKE XXXX-XX or XXXX-XXXX "X" = digit from "0" to "9" or letter from "A" to "F".
    MSX Memory POKE XXXXXXXX-XX or XXXXXXXX-XXXX "X" = digit from "0" to "9" or letter from "A" to "F".

    Please note that emulators will only accept cheat codes in the above formats (whatever ones are relevant). They will not accept codes in any other formats. So, if you cannot enter a code, carefully check its format. Finally, be aware that not all cheats you find on the Internet work, even on the real hardware. Never mix cheats from different sources and try to use cheats that are known to work on at least some other emulator.

  33. How do I search for cheats in any game?

    Most of my emulators include the Cheat Hunter tool letting you search for your own cheats in any game. To use the tool, follow these simple steps:

  34. I want to add my own cheats to the Cheatopedia.

    Yes, you can extend Cheatopedia with your own cheats. In order to do that, you will have to place a text file called custom.chts into emulator-specific folder: /sdcard/VGBA, /sdcard/VGB, or /sdcard/iNES. This file should have the following format:

    [(Custom Cheats)]
    Menu=Game 1
    Menu=Game 2
    [Game 1]
    Menu=Cheat 1
    Menu=Cheat 2
    [Cheat 1]
    12345678 9ABCDEF0
    87654321 0FEDCBA9
    Instead of adding single-line cheats separately, you can also use a shortened notation for them:
    [Game 1]
    Code=5A5A5A5A 23232323 : Cheat 1
    Code=76767676 01010101 : Cheat 2
    Once you are done entering cheats and place custom.chts file into proper folder, you should be able to access your custom cheats from the top Cheatopedia menu by clicking on "(Custom Cheats)".

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