Countdown Vampires Codes -

Play as Vampire Keith:
Enter Prince as a first name and Darkness as a last name to play as Vampire Keith with only a powered-up stun glove and some punch moves. After completing the game with Vampire Keith, you can play the next game with new weapons with unlimited ammunition.

Super Keith (Japanese version):
Enter Burger as a first name and Chicky as a last name to play as Keith with unlimited health and ammunition.

Hidden graphics (Japanese version):
Enter Yuka as a first name and Kobayashi as a last name. Get to the computer at the second or further save point to view actress Yuka Kobayashi, from whom Misato was based on. Two pictures will appear at each save point after the second one.

Alternate ending sequence:
Allow Geils to kill you to view an alternate ending.

Special mode:
Successfully complete the game in under seven hours to unlock special mode.

Blood type and vampires:
Selecting a blood type (A, B, O, or AB) at the start of the game will have an effect on the type and difficulty of the vampires that will be encountered during the game.