In case you don't know, Bust-a-Move 4 is the latest in a long line of super-cute puzzlers that focus on popping a dropping a sequence of random colored bubbles that burst when three or more of the same color are touching. Anything below this chain that isn't touching something else will come crashing down when you bust a chain. In the versus game, as you drop bubbles, you throw "combos" at your opponent, and that is when the fun really starts.