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.
Marathon is one I didn't remember, and as a general tip for things old and
mac, check
www.lowendmac.com which has LOTS of tips etc generated over the
years on the various email lists Dan Knight ran/runs.
I also strongly recommend doing what I do, BUY old software and use legal
copies. What you "do" teaches kids more than what you" say", and
running a
lot of bootleg software (except for MS products) gives the wrong message.
Showing that a bunch of old computers can still be a LOT of fun is the
RIGHT message.