Hard Level 6 - X Factor

Waves: 15
Lives: 10
Cash: $25

This took quite a few days and experiments with positioning and combinations of towers before I found a way to stop the critters breaking through. Unlike some levels I found that it was a good idea to use all types of tower, relying on their different abilities. For example, the laser towers have a long reach, but the blaster towers concentrate on nearby critters whch can be crucial in the final stages. Here's how I did it to keep all 10 lives intact.