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Quake II happened in 1997.
Quake II was created on 1997-11-30.
Quake II engine was created in 1997.
In all, 42.
Doom
Doom 2
Quake
Quake II
Quake III Arena
Half-Life (maybe)
Jedi Knight Dark Forces
Jedi Knight Dark Forces II
Star Wars Jedi Knight II: Jedi Outcast