Multiplayer Co'op Style Tower Defense?
I used to play the PC game Starcraft. It had an online service called Battlenet, which you played normal head to head games, but you also played custom games. One of the games was a tower defense game where you and three other players would build turrets and the different Starcraft units would go through a set path to the other side of the screen.
Years later, I get an iPad and there are a bajillion different tower defense games (some very good, some not so much). My question is, has anyone come across a coop multiplayer tower defense, like the Starcraft one I mentioned?