* Initial Challenge set, internal program still very much like "Police Trainer
VERSION 1.7, Fundamental rewrite :
* Diagnostic program made easier to use (Particularly Gun Calibration).
* Added an 'Auto' Difficulty setting, which sets the difficulty of each game according to performance by all players in a location.
* Circus of Mystery 'Balloon' Challenge rewritten (Can now shoot the balloons directly, rather than having to hit a target first).
* Alien Encounter 'Saucer' Challenge (top left on grid) rewritten (No penalty target).