I wouldn't be suprised if anyone hasnt posted this video yet on NG, and SORRY if it already has been, but holy shit. This is amazing.
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Its a hands-free level of mario, in which the level plays itself out using boosts and other things to move mario around and stuff.
I wonder how long this took...
Catoblepas
The best part is that the level has been made so that the sound effects sync with the music.