Revelations 13:2-8

great example of a level that breaks ALL the rules and is better for it. silent circles and old death corridor were already well known by the time this came out and it definitely takes plenty influence (and objects) from them, but the surreal stream of consciousness state this level occupies, from the combination of the megacollab format, the consistent color scheme and background, and the hard to impossible to obviously physically impossible gameplay, really sets it apart from anything before it and most things after it. helped a lot by the song, one of those obscure kinda dissonant newgrounds tracks that continues to grow on you