What are your favorite "gotta go in blind" games?

Which games blow your mind, but only if you know nothing about them in advance?

Best examples I can think of are:

What are yours?

(please no spoilers)

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Frog Fractions
- What, and I can't state this clearly enough, the FUCK did I just play?
  I wasn't prepared to have the history of punching explained to me in a frog platformer.
  
  I envy you.

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