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 the 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 models:
Enter KOBE as a password to get a card featuring Japanese model Kosaka Yuka in the North American version of the game. Note: Enter SABRAGE as a password in the Japanese version, in which Snake will also get a nosebleed.

Enter UMEDA as a password to get a card featuring Japanese model Asaki Yoshida in the North American version of the game. Note: Enter NOMEL as a password in the Japanese version, in which Snake will also get a nosebleed.

Enter ELYTS as a password to get a card featuring Saitou Yuu in the Japanese version of the game. Note: This will cause Snake to get a nosebleed, but has no effect on Teliko.

Enter MAEB as a password to get a card featuring Shibuya Eri in the Japanese version of the game. Note: This will cause Snake to get a nosebleed, but has no effect on Teliko.

Play as Teliko:
Successfully complete the Residential Zone mission.

Solid Snake (MG) card:
Successfully complete the game.

Raiden card:
Successfully complete the game two times.

Link battle option:
Successfully complete Stage 06 to unlock the "Link Battle" selection at the "Options" menu under the "Intermission" screen.

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