20. Quake
If Doom was a nuclear warhead, then Quake was a cruise missile. It was more focused, introduced a ton of innovations and refined the formula ever so further, tacking on a stronger plot and gameplay. From innovations such as the rocket jump, mouse look and solid multiplayer, Quake formed the basis for a lot of work that id Software would bring out in the next decade with the multiplayer centric Quake 3: Arena being most notable.
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