*** Note: Due to a break-in robbery in Q2 2009, I no longer own any GameBoy handheld.
This list will probably not be updated as, without a handheld, I see no use in purchasing more games. ()

GameBoy:
Dynablaster
Pokémon Blue

GameBoy Color:
Cannon Fodder
Dragonball Z: Legendary Super Warriors
Harry Potter and the Chamber of Secrets
Pokémon Crystal Version
Pokémon Special Pikachu Edition
Pokémon Trading Card Game
Tony Hawk’s Pro Skater 3
Worms Armageddon
Zelda: Oracle of Ages

GameBoy Advance:
Fire Emblem (Got stolen.)
Fire Emblem: The Sacred Stones
Ford Racing 3 (HORRID NO-QUALITY GAME! x_X)
Golden Sun
Guilty Gear X: Advance Edition
Kingdom Hearts: Chain of Memories
Lord of the Rings: The Third Age
Mario & Luigi Superstar Saga
Metroid (NES Classics)
Metroid Fusion
Metroid Zero Mission
Pokémon Leaf Green
Pokémon Mystery Dungeon: Red Rescue Team
Pokémon Ruby
Pokémon Sapphire
Sonic Advance
Sonic Advance 2
Sword of Mana
X-men 3: The Official Game