of individual Marines, and the Planning Screen, where orders are issued to the Marines by clicking on command icons. The Planning Screen has two maps; the smaller one on the bottom-left shows the operational area and the larger map a close-up view of the region selected by the player. Shown on the maps are the continuously updated positions of the Marines and their enemies. The game simulates fog of war by blacking out unexplored areas on the maps and representing unseen Genestealers as blips, unveiling them as Marines come within sight. Switching to the Terminator View Screen offers a first-person perspective of the mission through the Marines' eyes. The Screen contains five monitors: a large primary monitor at the bottom and four smaller secondary displays arrayed above. The primary monitor displays the view of the Marine under the player's control. The character is moved by pressing the keyboard's cursor keys or clicking the directional arrows next to the monitor. The mouse is also used to aim and shoot at targets, although the computer determines if an accurate shot kills the target. The secondary monitors show the views of other squad members. Although the player cannot control the movements of these Marines through these interfaces, he or she can click them to shoot the Marines' weapons at the centre of their views. However, the player can take full control of a Marine by switching the character's view to the primary monitor. At any time, Marines armed with Storm Bolters and not under the player's control assume "Overwatch" mode, automatically firing at obstacles and enemies that come into their paths. Storm Bolters have unlimited ammo but may jam under sustained firing, rendering the weapon useless for a few seconds until the malfunction is cleared. In melee the Power Fist is of limited effectiveness against a Genestealer's razor-sharp claws, while Marines armed with Lightning Claws or Thunder Hammer & Storm Shield are hand-to-hand specialists who forgo a ranged weapon. Although the action unfolds in real-time, the player can pause the game by clicking the "Freeze" button and entering "Freeze Time". While in this mode, every unit stops its motion while a timer runs down; the player can freely issue and modify orders to the Marines. Once the timer is depleted or the Freeze button is clicked again, every unit resumes its movement. The timer for Freeze Time slowly replenishes, as long as the