Play a clone of Tetris
Tetris has suggested efficacy in attenuating development or severity of trauma and it seems to have a beneficial ongoing cognitive effect also.
Don’t get Tetris™️, get a good paid version that lets you buy it and doesn’t show ads or track you after buying.
If you want the best of all three worlds, Lemuroid is an emulator based on Libretro, it can emulate a ton of different platforms including Gameboy. It’s free & open-source, unlike MyBoy.