Good PS1 platformers ? Ape Escape, Klonoa, Medievil, Oddworld, Skullmonkeys, Tombi series, Blasto (it's quite hard) and Croc 2.
For something quite underrated (not just platformers) for the PS1, here's a video about it, it has some good underrated games:
Well.. the genius minds over at Sony have decided not to release Ape Escape on PSN as a classic. Why? The world may never know..
OT:
Lol @platform said "nothing too challenging" LMAO!
..Fuck out of here with that lol. Get Rayman and Mega Man X4
oh yeah I also beat Rayman lol I forgot a lot in the OP
What? You beat Rayman? .. the original Rayman on PS1? You.. beat it?
Rayman had to be one of the most challenging platformers of that generation. You're telling me with a straight face that you beat this HARD game but right there in the OP, you're telling us not to name anything too challenging?