Distributed in Italy by Softel.
Based on 1988 Cyberdyne Systems/Thalamus C64/128 release.
No manuals found.
Pause the game and type “DELTA3”. The bottom display panel should change to purple and you will now be invincible to almost everything. Be aware that the object you shoot for a power-up will kill you if you run into it without shooting it first!
Once the cheat is active you can press ‘1’ to power down the current weapon, press ‘2’ to power up the weapon, and press ‘N’ to advance levels.