Take control of 16 different units and 15 different turrets to defend your base and destroy your enemy. You start at the cavern man's age, then evolve. There is a total of 5 ages each with its units and turrets.
Choose your antibiotics wisely to fight off the infections and save your patient. A fun way to relax and without you knowing it, you'll maybe even learn something useful.
Create a maze out of your towers to defend against 49 levels of advancing creeps. Five different towers with five Upgrades each including distinctive elite towers.
The good days are over. The creeps are determined to prepare a campaign against the human race. We're facing extinction if we don't do something about it. That's where you come in. Prepare your defense against the oncoming waves of creeps. Good luck!