Jehuty card
Enter "JEHUTY" as a password to get a card featuring Jehuty from Zone Of The Enders. This card will destroy all equipment and equipment level-ups in the current room.

Karen card
Enter "KAREN" as a password to get a card featuring Karen from Policenauts.

Mika card
Enter "MIKA" as a password to get a card featuring Mika from Snatcher.

Viper card
Enter "VIPER" as a password to get a card featuring Black Arts Viper from Metal Gear Solid on the Game Boy Color.

XM8 card
Enter "XMEIGHT" as a password to get a weapon card with 50 attack, 60% hit, 5.56mm bullets, 6 shots, 70% reaction, move 6 spaces, knockback, and burn.

Bikini model clip
Enter "ELYTS", "SABRAGE", "NOMEL", or "MAEB" as a password to see clips featuring Japanese bikini models. Note: These will cause Snake to get a nosebleed, but has no effect on Teliko.