Another one I remember is Spectre VR, a now-defunct 3-d tank game that's been around
for awhile...I remember that there was a shareware or freeware version that was
single-player only, but the commercial version supported many networked players as long as
each had a unique serial number registered. Should run fine on just about any color Mac --
it fits on a floppy and is pretty streamlined as 3d games go. Any Hacks N' Cracks
database or other decent serial number compilation will have plenty of serial numbers for
you to use.
Another good one, but probably too processor-intensive for the really old Macs, is
Terminal Velocity. Also defunct. This was an easy-to-play flight simulator type game with
nice graphics and sound.
There's also Marathon, which has been around awhile, but may be again too new for the
older machines. It's also a good bit more involved -- probably too hard for very young
kids to get into.
Good luck, HTH...
-- MB