Inca: The Mayan Adventure
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   The codes.

 CTRL ALT FIRE                    Instant kill enemies.
 CTRL ALT LEFT SHIFT              100% energy in space dogfights. 
 LEFT SHIFT RIGHT SHIFT ESC       Display next save password.
 SHIFT CTRL ALT INCA              Full lives and power.

   Press F1 at the restore game screen. The password to
 skip the first twelve levels will be displayed.