One of my first, and still favorite games:
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There is just something about the physics that makes it so fun to play still, it's a bit like quake in that respect, the movement is pretty basic, yet so deep (and not to mention fast).
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Rat maps: the game. A surprisingly good licensed game. It really inspired me to start mapping (though I finally started when discovering a Lego indie game with an easy to access editor).
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I rented this long ago for n64, and rediscovered it after seeing a cabinet of it at an arcade, then rediscovered it again when I learned there was still a pc community for it. There is no game like it, the physics are just like real rc cars, so it's just crazy, and really, how many other games actually take place at that scale?