Firefall is a very addictive arcade game that was originally published in 1993. The game has now been re-released as freeware. Yes, it is 100% FREE. It should run on any PowerPC Macintosh running OS 9, and it may work in OS X's Classic mode, but maybe not. Sometimes the first time you launch it in Classic the screen will be garbled. If you run it again, it will be fine.