did you know: the PS1 had a buuunch of games that came on multiple disks, from Xenogears's two disks, Final Fantasy 7 on three, Final Fantasy 9 on four disks... but there were games that came on even more disks than that! We recently (about a month ago) picked up a copy of Riven on PS1 for the sheer novelty of having a game on _five_ disks--we'd previously thought that nothing had ever been released for the system on more than four.
(and Riven is probably one of the best games of its era, if not one of the best of all time)