How To Control MKGBA2.0 GBA Games
X is the A button
Z is the B button
Enter is the START Button
Right Shift is the Select Button
1 is the L trigger
2 is the R trigger
A and B and START and SELECT at the Same time is Reset
The above button will take you to a list of Game Boy Advance games. You can save your progress by saving in-game. Your progress will be there when you return to the website. Use if you don't know much about emulators. Know that you will never be able to access your saved progress on other computers.
Uses the same core as IodineGBA.
How To Control IodineGBA Emulator
Settings > GBA Bindings
If you're confident enough in your knowledge of emulators, roms, and savestates, to opt for IodineGBA? I SHOULD HOPE you know how to bind keys.
An actual GBA emulator, just in your browser. Can load whatever game you want, use your own save states, bind keys, the works. Need your own rom game files and you have to upload this BIOS file under File > BIOS: