Volfied

Once you are in the game, you can move the "scanner" ship around the "shield line" at the edge of the playing field using the arrow keys. While you move around this edge, the ship will be protected from the aliens by a shield, indicated by a glowing circle around the ship. This shield is not infinite and you should make sure to complete each level as quickly as possible. A counter indicates how strong your shield is: when it reaches zero, any contact with an alien is fatal, whether you are on the "shield line" or not. The objective of the game is to cut out areas of the screen without touching any of the aliens. To do this, you'll press the spacebar, which activates the "laser cutter", and move away from the "shield line" to reach it again elsewhere. While you are in the process of drawing a line, your shield is inactive and touching an alien is fatal. If one of the aliens touches the line, it will send an explosive charge towards you and you must quickly move back to safety before it reaches you. When you go back to the "shield line", the area where the "boss" alien is not is filled up (points are scored by catching the other aliens) and the "shield line" is adjusted to surround the remaining area. The level is completed when a certain percentage of the total area has been filled. This percentage starts at 80%, but can increase in the later levels.