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