Suggestion: In the Movies once we watch the whole movie type thing allow us to get about 50 xp. In the Swimming Pool allow us to learn actual strokes :D.
I see what Norma means, I made a fault with a power tower, sold it got 57M made another blue tower(I sold blue tower) Got Fire Rate to 240 and the DPS is nearly 1.8M
http://www.thegamehomepage.com/play/super-stacker-2/Ballz-On-Drugs/c0J0J00317xt0Y0Y008f7mt0Y0Y1s6T7m_r2F0f001r0J0J001c0J0J001/ hard map, hard to get the straight thing to balance perfectly, but I did it perfectly.