Constant damage to all balls in range.
The saw tower deals constant damage to all balls in range. It's best suited to be place near the end of a level to help shrink balls down, or anywhere balls tend to collect.
The saw tower Dark Power gives it a chance to split a ball in half, creating two new balls that equal the health of the previous ball. This is very useful to increase the number of balls for subsequent levels. It's a good idea to have this power in an early level to take advantage of it.