System Defining Games

[Jpcc86]

Going by the "If you think about that system, you think about that game" premise:

NES: Super Mario Bros (Tho SMB3 would fit too)
SNES: Chrono Trigger
N64: The Legend of Zelda: Ocarina of Time
GC: Metroid Prime
Wii: SM Galaxy
WiiU: Mario Kart 8
Switch: The Legend of Zelda: Breath of the Wild
Gameboy: Pokemon Red/Blue
Gameboy Color: Pokemon Silver/Gold
Gameboy Advanced: Golden Sun 
NDS: New Super Mario Bros
N3DS: Monster Hunter 4 Ultimate
PS1: Final Fantasy VII
PS2: Final Fantasy XII
PS3: Uncharted 2. 
PS4: Bloodborne 
PSP: FF7: Crisis Core
XBOX: Halo: Combat Evolved
XBOX360: Gears of Wars
XBOXONE: Wouldnt know. GOW4 I guess.