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EmuDeck guide mGBA Tips and Tricks

How to Configure Multiplayer

This section is strictly referring to local multiplayer. mGBA multiplayer on the Steam Deck can only be done in Desktop Mode.

  1. In Desktop Mode, open mGBA
  2. Click File, click New multiplayer window
  3. On each window of mGBA, click Tools, Settings
  4. Select Controllers on the left and select your controller in the drop-down menu
  5. Steam Deck/Player 1: Microsoft X-Box 360 pad 0
  6. Player 2: Microsoft X-Box 360 pad 1
  7. Player 3: Microsoft X-Box 360 pad 2
  8. Player 4: Microsoft X-Box 360 pad 3
  9. Open the game in each mGBA window and you will be able to play multiplayer

If you are intending on trading with yourself (in a Pokemon game as an example), you will need to create a second copy of your save file and rename the file extension to .sa2.

How to Use the Gyro Sensor

IMPORTANT: As of September 2023, there is a bug with rumble while using gyro. Keeping rumble enabled will severly impact your framerate. Open the mGBA emulator and disable the rumble feature if you intend on using gyro.

Supported Games

  • WarioWare: Twisted!

Note: Yoshi Topsy-Turvy and Kirby Tilt 'n' Tumble use the tilt sensor instead. Read: How to Use the Tilt Sensor for instructions.

How to Configure the Gyro Sensor for the Steam Deck

How to Configure mGBA
  1. Open /home/deck/.config/mgba
    • ~/.config is an invisible folder by default. In Dolphin (file manager), click the hamburger menu in the top right, click View hidden files
  2. Right click config.ini, click Open with Kate or a text editor of your choice

  3. Under gba.input-profile.03000000de280000ff11000001000000, use the following template:

        tiltAxisY=4
    gyroAxisX=3
    gyroAxisZ=3
    gyroSensitivity=2.2e+09
    tiltAxisX=2
    gyroAxisY=1

  4. Save the file and exit out

  5. Open mGBA
  6. Click Tools at the top
  7. Click Game Pak sensors...
  8. Set the sensitivity in the bottom right to 34
How to Configure Steam Input
  1. In Game Mode, select the WarioWare: Twisted! ROM or the mGBA emulator
  2. Click the Controller icon
  3. Change the layout to EmuDeck - mGBA
  4. Click Edit Layout
  5. Select Gyro on the left
  6. Gyro Behavior: As Joystick
  7. Click the Gear icon

  8. Use the following template:

        Gyro Output Scale: 60
    Gyro Enable Button: Select a behavior of your choice
    Minimum Joystick X Output Value: 1
    Minimum Joystick Y Output Value: 1

  9. Back out, and select Joysticks on the left

  10. Click the Gear icon to the right of Right Joystick Behavior
  11. Set Deadzone Type to Default

How to Configure the Gyro Sensor for Non Steam-Deck Controllers

  1. In Desktop Mode, connect your non-Steam Deck controller
  2. Open mGBA in Desktop Mode
  3. Click Tools
  4. Click Settings
  5. Click Controllers on the left
  6. Select your controller in the drop-down menu
  7. Click OK
  8. Click Tools, Game Pak Sensors, and test your controller

Post-Configuration

To restore the default Steam Deck controls:

  1. Open mGBA in Desktop Mode
  2. Click Tools
  3. Click Settings
  4. Click Controllers on the left
  5. Select Microsoft X-Box 360 pad 0 in the drop-down menu

How to Use the Tilt Sensor

Supported Games

  • Kirby Tilt 'n' Tumble
  • Koro Koro Puzzle Happy Panechu!
  • Yoshi Topsy-Turvy

Note: For WarioWare: Twisted!, use the gyro sensor instead. Read: How to Use the Gyro Sensor for instructions.

How to Configure the Tilt Sensor for the Steam Deck

mGBA does not support using the Steam Deck's accelerometer for the tilt sensor at this time. Instead, you may either use a patch to remove the requirement for the tilt sensor or use an external controller.

Tilt Sensor Patches

To learn how to use these patches, see How to Use ROM Hacks.

How to Configure the Tilt Sensor for Non Steam-Deck Controllers

  1. In Desktop Mode, connect your non-Steam Deck controller
  2. Open mGBA in Desktop Mode
  3. Click Tools
  4. Click Settings
  5. Click Controllers on the left
  6. Select your controller in the drop-down menu
  7. Click OK
  8. Click Tools, Game Pak Sensors, and test your controller

Post-Configuration

To restore the default Steam Deck controls:

  1. Open mGBA in Desktop Mode
  2. Click Tools
  3. Click Settings
  4. Click Controllers on the left
  5. Select Microsoft X-Box 360 pad 0 in the drop-down menu

How to Use Cheats

Cheat Resources

This list is not comprehensive

Desktop Mode

  1. In Desktop Mode, open mGBA
  2. Load a game
  3. Click Tools at the top
  4. Click Cheats
  5. Click Add New Code
  6. Add your cheat

Game Mode

  1. While in game, use the left Trackpad and select the Cheats icon
  2. Steam Input profiles for mGBA ROMs and ES-DE are enabled by default. However, if you do not see the Trackpad menu, see How to Select a Steam Input Profile
  3. Select which cheats you would like to use

How to Roll Back mGBA to an Older Version

Preface

Your ROMs launch using a script created by EmuDeck, mgba.sh in Emulation/tools/launchers.

The script launches the corresponding emulator in /home/deck/Applications and specifically looks for two traits:

  • The most recently downloaded version of the emulator in /home/deck/Applications, based on the file/release date.
  • The emulator name at the beginning of the file. Anything after the emulator name is ignored.
  • For example, if the latest version of the emulator is 1351 and you would like to downgrade to 1349. When you download version 1349, you could rename it to EMULATORNAME-1349.AppImage, and EmuDeck's script will ignore the -1349 in the file name, allowing you to record which versions of the emulator you are using through the file name.

How to Roll Back mGBA

  1. Download the version of the emulator you would like to use from mGBA's GitHub: https://github.com/mgba-emu/mgba/releases
  2. Move the downloaded emulator from Step 1 to /home/deck/Applications
  3. (Optional) Rename or delete the original emulator file
  4. Right click the newly downloaded emulator, click Properties, click Permissions, check Is executable
  5. Your games will now launch using the version of the emulator you downloaded

How to Configure Language Settings

UI

  1. In Desktop Mode, open mGBA
  2. At the top, click Tools, click Settings
  3. Click the Interface tab
  4. To the right of Language, select your preferred language in the drop-down menu

In-Game

Languages are cartridge-specific. For example, if you want to play Golden Sun in French, you will need to dump a Golden Sun cartridge from France.

How to Create Multiple Save Files for a Game

If you would like to create multiple saves for a game in games where multiple save options are not available (the Pokemon games for example), you can do so by creating unique save files for the game.

  1. While in game, press Start + L3
  2. At the top, click File
  3. Click Save Games
  4. Select your preferred save slot, Use Player # save game