Now i didn't play this game by myself, and it doesnt really have "Levels", but sections broken into different screens.
Anyone who played VVVVVV Should Know: Doing things the hard way. AKA
Veni, Vidi, Vici.
6 screens that you have to go through twice to get to one Trinket (collectable), but it's like the megaman falling sections where the walls are covered in insta-kill spikes, only made harder because of your increased mid-air mobility.
For those of you who dont know VVVVVV, you can only flip gravity (when your on ground), so no jumping. The game trolls you by putting a 1 block high obstacle in front of the trinket. This forces you to go through the challenging Megaman-esque section to get it. Since deaths are only a minor penalty, only taking you back to one of the many scattered checkpoints, people have up to and more than 500 deaths just to beat it.