Use the following keys to move: ‘A' to move laser up, ‘Z' to move laser down, ',' to move laser left, '.' to move laser right and the space bar fire. Waves of guard ships will try to obliterate your planet by striking one of the three energy stores or your laser. The mother ship adds to the enemy's firepower and is worth more points. PROGRAMMING SUGGESTIONS More guard ships could be added, but make sure you update the ‘Position Guard Ships', 'Guard Fires' and 'Blow Guard Ship' routines. Amstrad Games Book | 
