@gunner:
Lvl 20, hit the first big blue box as soon after the first red one as possible. Then for the second red one, get the wedge to go to the left and turn the two balls to the right into boxes. After this, simply turn the last two boxes in the upper left corner into balls and sit back :P
I like the bubble stuff, however this TD gives me a very Desktop TD feeling :P. On the other hand: if you know how Desktop TD works, this should be a piece of cake :P
This game sucks, and that is just because the developer of this game took the easy way out on increasing difficulty... You cannot just give the opponent more cash without checking wether you did not make the game impossible. So, sorry: 1/5