360: mass effect
Gears of war
Dead space
Xbox live, not a game, but DEFINATELY helped define the generation.
Achievements, again, not a game, but was so successful, that Sony copied it, and I'm honestly surprised
Nintendo didn't end up copying it too.
PS3: TLOU
Uncharted
Wii: mario galaxy
Wii sports
Wii motion controller, not a game, but made Sony replicate it 100%, and Microsoft come up with kinect.
Mario kart
New super mario bros.







