Turrets

Attack Turrets

Red Turrets

High rate of fire, excellent range and the most damage of any turret, but certainly not cheap to upgrade! Upgrade their range three levels and the rate of fire by four to activate holding pattern, where the turret will keep rockets in the air, circling and ready to attack at all times.
Damage: upgrade0: 120, upgrade1: 350, upgrade2: 800, upgrade3: 1,950, upgrade4: 6,050, upgrade5: 11,500, upgrade6: 27,000, upgrade7: 48,900, upgrade8: 65,000.

Green Turrets

Average range, rate of fire and damage, but very cheap to upgrade. Green turrets can link together, where they fire at each other in a chain, each link along the chain adding an extra 25% to the laser beam's power.
Damage: upgrade0: 50, upgrade1: 120, upgrade2: 400, upgrade3: 1,500, upgrade4: 3,900, upgrade5: 9,300, upgrade6: 19,500, upgrade7: 35,000

Blue Turrets

Good rate of fire and good damage, but limited range. Upgrade their damage by three levels and their rate of fire by four they will occasionally freak out. The turret fires at four times its normal rate, with four times the normal damage. It freaks out for about 5 seconds, and you get a few seconds warning.
Damage: upgrade0: 30, upgrade1: 60, upgrade2: 150, upgrade3: 400, upgrade4: 1,200, upgrade5: 3,100, upgrade6: 8,500, upgrade7: 18,400, upgrade8: 46,000.

Yellow Turrets

A poor rate of fire to begin with and quite a low range, but these turrets can poison attackers, causing them to move slowly for a period of time before they recover. The more you upgrade the damage on this turret, the more powerful its poison is and the longer the attackers stay stunned for. These turrets also have the same freak out ability as blue turrets.

Modifier Turrets

Need to increase the damage of a turret but can't upgrade it any further? Build one of these and any turret in it's range gets a 40% boost to it's damage.

This little radar station extends the range of any turret in it's range by 100. The extended range is marked as a dotted line when you view a turret's range by pressing R.

And to increase the rate of fire, this turret is your friend, which doubles the rate of fire of any turret in it's range.

Same as the damage booster but you get a 100% increase in damage. On the downside, this modifier isn't cheap.

Exchange Turrets

Exchange turrets are like modifiers but they increase one attribute of the weapon in exchange for a decrease in another. The upside to this exchange is that these exchange turrets are much cheaper than the normal modifier turrets.

Any turret in range gets a 100% boost to it's damage, but it costs 30% of the range and 30% of the rate of fire.

Any turret in range gets a boost of 100 to it's range, but at the cost of 25% of the rate of fire.

Any turret in range gets double the rate of fire, but at the cost of 40% off the damage and 10% off the range.