Psycastria was developed by Gary Partis and released for the BBC Micro in 1986 by Audiogenic Software. Psycastria is a top-down horizontal scrolling shooter. Go across each base, destroy the 10 energy pods that power the Psycastrian war machine while avoiding buildings and engaging alien spacecraft, then go to the next base. Unusually for a shooter, you can turn around at any time to go after any missed targets. Between bases, there is a bonus level that tests your timing at destroying aliens.