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.
