Ever since Gamestop's GB and GBC sale. the collection of handheld games have poured on and on.
OH! THE NOSTALGIA RUSH!
Gameboy:
Super Mario Land 1, 2, and 3 (Wario Land)
TMNT Fall of the Foot
Amazing Penguin
Bubble Ghost
Ninja Gaiden Shadow
Operation C
Kirby's Dream Land 1 and 2
Tetris
Battle Unit Zeoth
Cosmotank
Final Fantasy Adventure (Great blend of Adventure/RPG genres)
Gameboy Advance:
Metroid Fusion
Mario & Luigi Superstar Saga
Megaman Zero