Barbarian Cheats (PC)

During the game, type '04-08-59'. The screen should turn grey. If so, you are now
invulnerable and have unlimited lives. 

  To kill the final Wizard, you must have a shield. When his shot comes at you, use the
defense icon, and it will fly back at him.

For infinite lives and invulnerability, type "04-08-59" while playing.