Half n Half

 is the 58th level in Bloons 2, and the 10th level in the Rubber Jungle zone.

Solution
Bounce against the angled Rubber Block below the Bonus Dart Bloon and let it so that it also hits the bloons. Then bounce on a square Rubber Block such that it hits the Tack Bloons, which should also trigger the Spiky Bloon. Then get the dart to bounce such that it hits the Bomb Bloons.