Quake 2 for Macintosh is out of my choices, the best of the Quake series. It has good enough graphics and gameplay, and it will run on most G3 Macintoshes. With the upcoming Quake 3, it is major competition, but it all depends on your personal preference.
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Action Q2 is one of the most amazing mods ever to hit the Macintosh. It completely changes the entire Q2, and transforms it into something as though it were a movie.
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