You know you're being watched. You know the Sentinel is out to get you - anticipating your every move, stopping at nothing to destroy you. Maneuver with cunning through over 650 eerie levels of white-knuckle gameplay. Based on the classic hit Sentinel by Geoff Crammond, with a haunting soundtrack produced by famed horrormeister John Carpenter, this chilling thriller tests every strategy in your arsenal, every nerve in your body... and any hope of your survival.