Board Thread:Off-Topic/@comment-71.163.100.241-20180722230440/@comment-36768512-20180921152300

Ezw103012213 wrote: A ghost bloon Oh i see those things are impossible too pop but can only be found in sandbox. Ninja Kiwi put them in there to let u see how the tower would attack a bloon

Either that or your talking about the boss on BSM2 Mobile