Seems like some people think this thread is a "your top 5 games per system" thread, which, by my understanding, it isn't.
NES:
1) Super Mario Bros.
2) Super Mario Bros. 3
3) The Legend of Zelda
4) Duck Hunt
5) Mega Man 2 (Hate to put this on the list instead of my beloved MM3, but 2 definitely caused more of an impact.)
Game Boy:
1) Tetris
2) Pokémon Red/Blue
3) Super Mario Land
4) Kirby's Dream Land
5) The Legend of Zelda: Link's Awakening
Genesis:
1) Sonic the Hedgehog
2) Mortal Kombat
3) Sonic the Hedgehog 2
4) Street Fighter II: The World Warrior
5) Streets of Rage
SNES:
1) Super Mario World
2) Donkey Kong Country
3) Street Fighter II: The World Warrior
4) The Legend of Zelda: A Link to the Past
5) Super Metroid
PS:
1) Final Fantasy VII
2) Gran Turismo
3) Metal Gear Solid
4) Tekken 3
5) Crash Bandicoot
N64: (Obvious list is obvious)
1) Super Mario 64
2) The Legend of Zelda: Ocarina of Time
3) GoldenEye 007
4) Mario Kart 64
5) Super Smash Bros.
Dreamcast:
1) Sonic Adventure
2) Marvel vs. Capcom 2: New Age of Heroes
3) SoulCalibur
4) Phantasy Star Online
5) Shenmue
GBA:
1) Pokémon Ruby/Sapphire
2) Pokémon FireRed/LeafGreen
3) Advance Wars
4) Super Mario Advance
5) Sonic Advance
PS2:
1) Grand Theft Auto III
2) Grand Theft Auto: San Andreas
3) Gran Turismo 4
4) Grand Theft Auto: Vice City
5) Ratchet & Clank
Xbox:
1) Halo: Combat Evolved
2) Halo 2
3) Tom Clancy's Splinter Cell
4) Fable
5) Star Wars: Knight of the Old Republic
GC:
1) Super Smash Bros. Melee
2) Resident Evil 4
3) Metroid Prime
4) Prince of Persia: The Sands of Time
5) Animal Crossing
DS:
1) New Super Mario Bros.
2) Brain Age: Train Your Brain in Minutes a Day
3) Nintendogs
4) Mario Kart DS
5) Pokémon Diamond/Pearl
X360:
1) Halo 3
2) Call of Duty: Modern Warfare 2
3) Call of Duty 4: Modern Warfare
4) Grand Theft Auto IV
5) Call of Duty: Black Ops
PS3:
1) Call of Duty: Modern Warfare 2
2) Call of Duty 4: Modern Warfare
3) Grand Theft Auto IV
4) Gran Turismo 5
5) Call of Duty: Black Ops
Wii:
1) Wii Sports
2) New Super Mario Bros. Wii
3) Wii Fit
4) Super Smash Bros. Brawl
5) Wii Play
