You think Bloons needs a Crysis compatable computer? You are sadly mistaken. Get a job and buy a decent computer, and don't complain because your stoneage computer can't run it.
Level 15 was very easy. Bring the blue to a slow stop and let them fall underneath. Do the same afterwards to the red; making them a cube before they fall off, and make sure they are going very slow when they fall off.
This tutorial was byfar the hardest and I understood about 20% of what was going on. at least i made it through it. i had to make my own explosion clip which was hard to figure out..
i dont really get it. it still has tutorials on what to do almost right until the games ending. seems like the directions of a game. and then its over :( no real game.