When more money is used to call in backup, more powerful units can be called in. By calling in allies, you can hold back the enemy more easily. The more powerful the enemy, the more money you get from killing them. You collect points in the unit of money by killing enemies. As levels get harder, there are more floors and more powerful enemy units and bosses. The bases, both yours and your enemy's, can also shoot you or your allies. Each side has four large turrets called barbettes on each floor. The aim of the game is to destroy all enemy bases using your commando character and your allies.
Alternatively, you can move with the arrow keys and switch weapons with the mouse's scroll wheel. The Q and E keys are used to change weapons. The Space key is used to call allies, and aiming and shooting is done by using the mouse. By pressing S 2 times in a row, the player would move to a lower floor of the battlefield, if exist in a particular level. Moving is done by using the keys A, W, S, and D.
