Rap Battles from Spinning Hat is a game of competitive improvisational rap. The game comes with a faux boombox, some dice to select the beat, some cards whose purpose is indecipherable to me, and some money to keep score. You have twenty seconds to rap to the beat, after which you are judged by your fellow players and/or the judge. ( source )
The rest is here:
Rap Battles, the Game
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