[PhasmaFelis]

Which was fascinating, technically speaking, because the PlayStation was never intended to be played without a game disc in the drive. Vib Ribbon's graphics are so brutally simple because the entire game has to fit in 2 megabytes of RAM when you remove the disc. It loads it on boot and then never touches the data track again.

[EdSchouten]

There are actually a couple of games that were like that. I remember Ridge Racer 1 also allowed it.