Co-op play finally comes to the Bloons TD series! In Co-op Mode you'll be teamed up with another bloon popper, or you can set up a private match with a friend. You'll share lives and each earn half the money from pops, then work together managing your own side of the track to beat the bloons. Communicating with your ally using the chat system (hit enter, type your message and hit enter again) is very important, particularly for the expert track.
The popular browser-based Bloons franchise extends to the tower defense world, bringing monkeys, darts, balloons and all manner of crazy things to the table.