@mausmalone FYI - Mac OS 9 can be installed as a bootable option on _most/all_MDD systems and offers full graphics acceleration. It can also be installed as sort of a VM (Classic Environment) where it may struggle to play anything too fancy. If your G4 has a FireWire 800 port on it you may need a modified MacOS9Lives install disc.
USB booting is kinda hacky on these PowerPC Macs, so when possible burn a CD to make your life easier. Have fun!