How this would work:
The game-mode would use randomly generated maps, and what you would do is try to collect as many stars as possible. You'd also hear some arcade music to go along with this in the background. As a player, it's your job to collect the stars faster than everyone else within a time limit for example, let's just say you'd have 2:00 to collect 50/50 stars. Whoever finds the most, wins and same goes if there is a tie (then they both win). During each new map change, the stars would be hidden in randomized places.
I think this would sort of be like a party mini-game.