Toast22A: If you want the glitch it is annoyingly easy: just put launchers right next to each other from the left and hit the turtles at the center facing right. At 2nd or 3rd launcher I always got that and that annoys me since it is quite slow.
Bloons Tower Defence 1 looks lame... I don't know why bloons 1, 2, 3 and 4 got so good ratings although they are boring as hell when you get to know all upgrades.