you can do the first four levels with one cannon tower. just upgrade it after 1, 2, and 3. put it in the lower right corner.

I beat lvl 39 on my last try, only upgraded fire and invested the rest

Freakin sick just got 23,671!

I wasted at least 4 hours today. Level 37 gets me.

27,364 what now

Try to get 69,000 of whatever the top people are getting, that's what now!

I just died on lvl 39 with freaking 8 upgraded rocket towers!!! WTF??

54,125 this time.

ok played it again and got 66,xxx ... definitely addictive.