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A competition where you play the piano blindfolded.

Comments  
Hello onelook,

A. Your sentence is incomplete.

B. "blindfolded" is an adverb and means "You play the piano (with your eyes covered by a piece of cloth) in the competition."

C. If you want to complete your sentence, you can say:

It's a competition where you play the piano blindfolded.
Best wishes,

JA