Best use of 5 bucks ever ! This is multiplayer only, but it's really a blast with friends. Even when you lose, you can't put the controller down. Some weapon choices are questionable, like snake weapons, but it's extremely configurable, so you're basically buying one game with as many modes as you can invent for it.

I haven't tested the online multiplayer, but it seems superfluous to me at least, and my network isn't very good.