About
The player assumes the role of captain of a battle starship, charged with defending the frontiers of space from hostile alien ships, which come in two sizes — large and small. The larger ships have cloaking devices which make them invisible. Damage is inflicted on ships when they are shot or rammed by other ships. Uniquely for the time, the player vessel remains locked in the centre of the screen and the world rotates and moves around it. Player shots also have limited range and are subject to the same rotation as everything else, which means the player needs to predict where shots will need to go in order to hit the enemies. The ship has both long range scanners and shields but may only use one at a time. By default, the game will automatically switch between them based on the proximity of enemy vessels but the player can optionally take full control. Using shields, thrusting, turning and firing all use up energy which is also depleted when hit by enemies. Energy will automatically replenish, most quickly if the shields are off and the starship is not moving, but this leaves the player open to attack. Unusually, the player is never expected to return their ship from the frontiers. Each individual voyage is a separate command, and lasts either until the player's vessel is destroyed or until they use an escape capsule. If the escape capsule is successfully launched, which means firing it so that it doesn't collide with any enemy ships, and the player is judged by Star-Fleet to have killed enough enemies during his command then he is given a new commission and a new and visually different ship. 8 points are scored for a small ship and 12 for a large ship. Starfleet's opinion of the player's performance ranges from them being "furious" to "delighted". The number of points required to reach the next level is not fixed. Sometimes a score of 60 will suffice and sometimes a score of 80 will not be enough to guarantee automatic promotion to the next level, assuming the escape capsule was jettisoned safely. Strangely, more points were awarded when an escape capsule collided with and destroyed an enemy ship as opposed to being shot or colliding with the starship. Later commands take place in faster environments and with greater numbers of enemy. There are 8 different starship designs, which repeat after level 8.
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