GBA Wasm

Idle.
Keyboard — D-pad arrows · m A · n B · q L · e R · Enter Start · v Select. A gamepad works too. Drop a .gba file on the picture to play your own.

GBA Wasm

Rotate to landscape for the best view.

L
R
Start
Select
A
B
Menu
Landscape gives a bigger picture.
Remap Controls
Click a binding, then press the new key or controller button.