The only one I remember is that level in Rayman where you have to plant seeds to climb ahead of rising water. That was a weird game in terms of difficulty, I mean, everyone first played it as kids when it felt like it was impossible, but for a competent adult gamer it's actually not an especially easy nor difficult game (would still be hard as balls for me though 'cause I don't do platformers), except maybe that level with all the darkness and the spikey pencils.