google macintosh garden for abandonware mac games.

Btw - don't bother with IIGs or Mac SEs. If you want a pre-OSX mac, get one of the early iMacs (Anything except the first revision), and stick OS 9.2.2 on it. You can run basically anything except the most ancient of games (like stuff made for System 1.0 or something).

Anyway:

1) Diamonds
2) Simcity, Simcity 2000, Simanything
3) Civilization I
4) Marathon, Marathon 2, Marathon Infinity (all available for free online now)