List of third-party OPK applications

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This article lists third-party OPK-format applications built for the FunKey S. Freely downloadable from this page, these applications allow users to add additional functionalities to their devices. Note, however, that as the device's Instant Action autosave feature is implemented on a program-by-program basis, users must remember to manually save their progress in any third-party program that hasn't implemented the Instant Action feature. Also note that while many devices use OPK as an application format, only OPK applications compiled specifically for the FunKey S are compatible with it. Once a FunKey S OPK application is downloaded, it can be installed by simply placing it in a folder at the root of the device's file system, with the Applications, Emulators, and Native games folders available by default for file management. Applications available for download on this page are organized as they would be accessed from the Gmenu2x launcher — into the following three groups:

Should you wish to build or modify OPK applications yourself, you may download a version of SquashFS configured for editing OPK applications on Windows here. After extracting the SquashFS folder from its ZIP archive, add the OPK file that you wish to edit to the folder and double-click the 1. EXTRACT_OPK.bat file. This will create a folder called squashfs-root, containing files for the application's configuration settings, icon image, and binary data. Unless you have prior experience configuring OPK applications, however, it is recommended that you only modify the icon file, a 32-pixel square PNG format image file that represents the application in Gmenu2x. In doing so, ensure that the replacement icon file is also a 32-pixel square image, in PNG format, and named exactly as the original file was (icon.png is replaced with icon.png). Once you have finished modifying the application, return to the SquashFS folder and double-click the 2. MAKE_OPK.bat file, which will apply your modifications to the submitted OPK file. After several windows pop up and disappear, your application will be modified and ready to be returned to your FunKey S. Note that if there are multiple applications that you wish to modify, you must do so one at a time. For additional instructions on how to use SquashFS to modify or build OPK applications, it is recommended that you join the FunKey Community Discord Server.

Although the wiki-hosted versions of the applications listed in this article are updated periodically, development repository links are also listed where applicable in case any of them have been updated in the interim.


The following applications are any programs for the FunKey S that are neither emulators nor games. Alongside each application is listed a general description of it.

Name Description Author(s) / Compiler(s) OPK
Gmenu2x Audio Fix Disables the audio amplifier while in the menu of Gmenu2x, preventing a buzzing sound from occurring. Drum78 Link
Clock Used to set the system's time for RTC functionality. Gameblabla Link
EasyRPG Interprets games made with RPG Maker 2000 and RPG Maker 2003. Download
Game Music Emu Music player that emulates the audio of several retro systems. Drum78 Download
KeyKalc Graphing calculator program. Robbi Blechdose Link
MPlayer Enables video playback in both original and stretched aspect ratios. NovemberJoy Download
Pocket CDG Karaoke and MP3 music player; matching MP3 and CDG (can be a blank text file should you just want to play MP3 files) are needed, with a song's CDG file used to play it. As non-standard MP3 file settings can cause music to be played too quickly, should this occur, you should "convert" the MP3 file to a standard MP3 format using a converter such as this. Drum78 Download
ST Linux terminal program. Michel (FunKey Team) Download


The emulators listed in this section add to the capabilities of the FunKey S by enabling improved emulation of several supported systems and general emulation of several unsupported systems. As a means of helping users choose which emulators to use, especially for cases in which there are multiple options, the following table lists currently unsupported systems on the left with the best emulators currently available for them on the right:

MAME 2000
Stella 2014
FinalBurn Alpha
Neko Project II Kai
Fake 08

Should a system not be listed above, it is either already officially emulated by the FunKey S or has unofficial emulation that lacks sufficient functionality for use by a general audience. To illustrate cases of the latter, each emulator is rated from low to high for both overall emulation accuracy and speed. In addition to the emulators listed on this page, should you wish to emulate the BBC Micro, CHIP-8, or ZX Spectrum, meta-emulation is an additional option for third-party emulation. Should one of the emulators listed on that page be incompatible with the default gpSP emulator, however, the SDL Retro mGBA core or the standalone VBA Next emulator would be needed to use the meta-emulator.

SDL Retro

Two options for using SDL Retro are available: All-In-One and One-By-One.


As the first of these includes all default SDL Retro cores in the OPK file itself, all the user must do to install it onto their FunKey S is add it to a folder at the root of the device's file system just like any other application, emulator, or game.


Should you prefer to only have the emulator cores you intend to use installed, and thus speed up the SDL Retro's core selection process, you may alternatively download the One-By-One option.

While its download also includes an OPK file, the emulator cores themselves are included in a separate cores folder that must be placed in the /mnt/FunKey/.sdlretro file location of the FunKey S for SDL Retro to function.

BIOS File Location

If one or more required BIOS files are listed alongside a core you wish to use, ensure that those files are named and located in the /mnt/FunKey/.sdlretro/system file location for optimal emulation results.

Game Specific File Locations

  • In the case of blueMSX, download, extract, and place that emulator's Databases and Machines folders in the /mnt/FunKey/.sdlretro/system file location.
  • In the case of Neko Project II Kai, the required PC-9800 files listed in the table below should be placed in the /mnt/FunKey/.sdlretro/system/np2kai file location.

Can't See .sdlretro Folder

If you don't see the .sdlretro folder, your computer's Unix-based operating system is hiding hidden folders. To enable the viewing of such folders on MacOS, use the Shift+Cmd+Period key combination. To do so on ChromeOS, click the three-dot icon at the top-right of the Files application and select the Show hidden folders option.

Core System Required BIOS file(s) Accuracy / Speed In-Game Save File Format Author(s) / Compiler(s) OPK
One-By-One All-In-One
Beetle Lynx Atari Lynx lynxboot.img High N/A Coverilla
Download Download
blueMSX ColecoVision Databases folder
Machines folder
CrocoDS Amstrad CPC N/A
FCEUmm Famicom Disk System disksys.rom SAV
FreeChaF Fairchild Channel F sl31253.bin
Gearboy GB N/A SAV
Genesis Plus GX ColecoVision BIOS.col N/A
Game Gear N/A SAV
Master System
Sega CD bios_CD_E.bin
Sega Genesis N/A SAV
SG-1000 N/A
gpSP GBA gba_bios.bin Medium
GW Handheld electronics N/A N/A
Hatari Atari ST tos.img High
GBA High
GBC High
Neko Project II Kai PC-9800 font.bmp
O2EM Magnavox Odyssey² o2rom.bin
c52.bin   ↑
g7400.bin ⦙
jopac.bin  ⦙
PokéMini Pokémon Mini N/A
Potator Watara Supervision
ProSystem Atari 7800
QUASI88 PC-8000 n88.rom
RACE NGP N/A NGF (non-functional)
Retro-8 Pico-8 Medium
SMS Plus GX ColecoVision BIOS.col High
Game Gear N/A SAV
Master System
SG-1000 N/A
SNES9X 1.6 SNES High
SNES9X 2005 High
SNES9X 2010 High
Stella 2014 Atari 2600 High N/A
vecx Vectrex Medium
VeMUlator VMU


If one or more required BIOS files are listed alongside an emulator, ensure that those files are named and located in the following file locations for optimal emulation results:

  • /mnt/FunKey/.3doh for 3DOh
  • /mnt/FunKey/.pcfxemu for PCFXEmu
  • /mnt/FunKey/.smsplus/bios for SMS Plus GX

If you choose to use the version of SMS Plus GX included in the SDL Retro OPK, follow the instructions listed in the section above instead. As PCSX ReARMed Ultimate and PicoDrive simply replace their default counterparts when initially loaded, their BIOS files (if not already present) go in the regular /mnt/PS1/bios and /mnt/Sega Genesis/bios file locations, respectively. Should you wish to instead add FinalBurn Alpha 2012, Gambatte, MAME 2000, or VICE to the SDL Retro OPK to lessen the number of icons present in the Emulator tab of Gmenu2x, you can alternatively download, extract, and place their SO format emulator core files in the /mnt/FunKey/.sdlretro/cores location of the FunKey S file system (if the cores folder is not already present, create it first). If you don't see the .sdlretro folder or the .3doh, .pcfxemu, or .smsplus folders disappear upon creation, your computer's Unix-based operating system is hiding hidden folders. To enable the viewing of such folders on MacOS, use the Shift+Cmd+Period key combination. To do so on ChromeOS, click the three-dot icon at the top-right of the Files application and select the Show hidden folders option.

Emulator System Required BIOS file Accuracy / Speed In-Game Save File Format Author(s) / Compiler(s) Repository SDL Retro Core OPK
3DOh 3DO bios.bin Medium
N/A Gameblabla Link N/A Download
DOSBox Pure DOS N/A Medium Drum78 Download
Fake 08 Pico-8 Medium
Gameblabla Link Download
FinalBurn Alpha 2012 Multiple Drum78 Link Download Download
FinalBurn Neo Link Download Download
Gambatte GB High SAV Link Download Download
Gnash Adobe Flash Medium
N/A Gameblabla Link N/A Download
LameDS DS Link Download
MAME 2000 Multiple Medium
Drum78 Link Download Download
Mednafen NES High SAV N/A Download
PCFXEmu PC-FX pcfx.rom High
N/A Gameblabla Link Download
PCSX ReARMed Ultimate PlayStation SCPH1001.BIN High MCD Drum78
Link Download
PicoDrive Sega 32X N/A SRM Drum78 Link Download
Sega CD bios_CD_E.BIN
Sega Genesis N/A SRM
Master System
PiEMU Aquaplus P/ECE N/A Gameblabla Link Download
PokéMini Pokémon Mini Link Included Download
SMS Plus GX ColecoVision BIOS.col Link Download
Game Gear N/A SAV
Master System
SG-1000 N/A
SwanEmu WS EPS Link N/A Download
VBA Next GBA High
Link Download
VBEmu Virtual Boy High SRM Link Download
VICE Commodore 64 D64 LordEnum Download Download


The following applications are freeware games that have either been ported to or natively developed for the FunKey S. To facilitate list navigation and game selection, alongside each game is listed its genre. To play the OPK ports of commercial games, one or more additional files containing necessary copyrighted assets must be provided by the user from their own legally acquired copy of the game. The data files of such games should be grouped together in a folder located at that game's listed file location. Games requiring several of a specified file type to run have an asterisk placed after the applicable file type(s).

Make note of the following information for the following games:

  • While Doom, Doom II, and Final Doom only require a single WAD file each, add-on WAD files also can be used
  • While Quake only requires its PAK0.PAK file to launch, to access the full game, the PAK1.PAK file is also required
  • Due to a change made to the libvorbis package in the FunKey-OS V2.2.0 update, VVVVVV is currently non-functional when using the latest official system firmware. To fix this incompatibility without downgrading the firmware of one's device, a third-party firmware revision can be installed to fix the issue until the next official firmware update is released. Other changes made by the third-party firmware update include:
    • Adding UTF-8 support to Gmenu2x
    • Replacing swap usage with battery percentage on the system statistics overlay
    • Updating the PicoDrive (Sega Genesis/Mega Drive) emulator
    • Switching the default Game Gear emulator from Mednafen to PicoDrive
    • Adding Mona and the Witch's Hat Deluxe to the list of included homebrew Game Boy Color games
    • Removing a buzzing sound from Gmenu2x
As with official firmware updates, simply download and add this FWU file to the root folder of your FunKey S to install the update. Should you wish to flash this version of FunKey-OS directly onto a MicroSD card, an IMG file for the firmware revision is available here. Further instructions on the above processes can be found here and here, respectively.

If you don't see the .local folder, or the .cannonball, .eduke32 or .ecwolf folders disappear upon creation, your computer's Unix-based operating system is hiding hidden folders. To enable the viewing of such folders on MacOS, use the Shift+Cmd+Period key combination. To do so on ChromeOS, click the three-dot icon at the top-right of the Files application and select the Show hidden folders option.

Name Genre Author(s) / Compiler(s) OPK Data Files Folder
OPK Game
Bibi Arcade Vincent (FunKey Team) Link N/A N/A
Blockdude Puzzle Joyrider3774 Link
Crafti Sandbox Gameblabla Link
Dinothawr Puzzle Drum78 Download Game files (launch via
Divi-Dead Visual Novel Gameblabla Link DL1*
Formula 1 Game & Watch Arcade Joyrider3774 Link N/A
KeyCraft Sandbox Robbi_Blechdose Link
PrBoom Doom FPS Coverilla
Link WAD
Doom II
Final Doom
Duke Nukem 3D FPS StupidHoroscope Link DUKE3D.GRP /Funkey/.eduke32
Ganbare-Natuskian Platformer Gameblabla Download N/A
Heboris Puzzle Link
Cannonball Out Run Driving Drum78 Link Out Run Arcade Rev. B ROM files /Funkey/.cannonball
Quake FPS LordEnum Link PAK0.PAK
XRick Rick Dangerous Platformer Link N/A
Rubido Board game Joyrider3774 Link
ScummVM SCUMM engine games Various Drum78 Link Game's data files
Sonic Robo Blast 2 Platformer Gameblabla Link N/A
Supertuxkart Racing Link
TriSpace Space combat Robbi_Blechdose Link
VVVVVV Platformer Jack Link /FunKey/.local/share/VVVVVV
Wolfenstein 3D FPS Link WL6* /FunKey/.ecwolf
Worship Vector Tower Defense Gameblabla Link N/A