I went to pop in my Leopard retail DVD into a Lampshade G4 and lone and behold, it won't take a dual layer disc. So I took that same DVD, put it in a PowerBook and booted into Target Disk Mode, only for lampshade to complain about how this version of Mac OS X cannot be installed and blah blah. I'm like, wait... I've played this game before. Doesn't it have to be a certain version of Leopard (like maybe 10.5.2 or lower?) or was there a 4-disk set of CD's? I remember doing that in Tiger, but for the life of me, I can't remember how to install Leopard on a G4!