You are in control of the defensive systems for the vast SOTER underground bunker. You are the last line of defense for the survivors taking refuge below - protect them at all costs.

Mouse: Aim and fire the primary weapon.
A/D Key: Rotate 90 degrees left or right.
W/S Key: Rotate a fast 180 degrees.
Spacebar: Fire a rocket.
E Key: Set off an EMP charge.
Q Key: Detonate a nuke.
R Key: Buy upgrades (survival mode only).
ESC Key: Pause menu (includes option to restart the current level)