Rising Zan: The Samurai Gunman Codes -

Hard difficulty setting:
Successfully complete the game under the normal difficulty setting.

Expert difficulty setting:
Successfully complete the game under the hard difficulty setting.

Play as Sapphire:
Successfully complete the game under the normal difficulty setting.

Serious mode:
Successfully complete the game under the hard difficulty setting. When this mode is selected, enemies can kill you with one hit.

Hustle time mode:
Successfully complete the game under the expert difficulty setting. When this mode is selected you will have unlimited hustle time.

Ultimate sexy mode:
Collect all 15 Hero Badges. When this mode is selected, you character will be wearing just his underwear.