Sometimes, looks can far exceed the reality of actually using an object. We suspect that's the case with Rap Battle, although we hope it's not the case.
According to the write up, the aim of the game is to be the first player to earn $1000 by rapping, which you'll do by picking up Rap card and Star cards, as well as throwing a dice to pick your tune. That tune is played out via the boom box and if successful, you pocket the cash.
Love the boom box, not convinced it'll be a good game. But at £19.99, it sounds like a lot of fun if you have a houseful after a night on the town.
Spinning Hat website
Via Electric Roulette