Strain card (No. 046)

• Enter "NOJIRI" as a password to unlock the Strain card (No. 046). Enter "VRS" as a password in the Japanese version of the game.

Gijin-san card (No. 099)

• Enter "SHINTA" as a password to unlock the Gijin-san card (No. 099). Enter "CCT" as a password in the Japanese version of the game.

Reaction Block card (No. 119)

• Enter "KONAMI" as a password to unlock the Reaction Block card (No. 119).

Viper card (No. 161)

• Enter "VIPER" as a password to unlock the Viper card (No. 161).

Mika Slayton card (No. 166)

• Enter "MIKA" as a password to unlock the Mika Slayton card (No. 166).

Karen Houjou card (No. 170)

• Enter "KAREN" as a password to unlock the Karen Houjou card (No. 170).

Jehuty card (No. 172)

• Enter "JEHUTY" as a password to unlock the Jehuty card (No. 172).

XM Eight card (No. 187)

• Enter "XM8" as a password to unlock the XM Eight card (No. 187).

Mr. Sigint card (No. 188)

• Enter "SIGNT" as a password to unlock the Mr. Sigint card (No. 188). Enter "SGNT" as a password in the Japanese version of the game.

Sea Harrier card (No. 197)

• Enter "SHRRR" as a password to unlock the Sea Harrier card (No. 197). Enter "HRRR" as a password in the Japanese version of the game.

Decoy Octopus card (No. 203)

• Enter "DCY" as a password to unlock the Decoy Octopus card (No. 203). Enter "DCYCTPS" as a password in the Japanese version of the game.

Roger McCoy card (No. 212)

• Enter "MCCY" as a password to unlock the Roger McCoy card (No. 212). Enter "RGR" as a password in the Japanese version of the game.

Reiko Hinomoto card (No. 281)

• Enter "HNMT" as a password to unlock the Reiko Hinomoto card (No. 281). Enter "XX" as a password in the Japanese version of the game.

Kinoshita Ayumi card (No. 285)

• Enter "AYM" as a password to unlock the Kinoshita Ayumi card (No. 285). Enter "KINOSHITAA" as a password in the Japanese version of the game.

Ishii Meguru card (No. 286)

• Enter "MGR" as a password to unlock the Ishii Meguru card (No. 286). Enter "SHIIMEG" as a password in the Japanese version of the game.

Natsume Sano card (No. 287)

• Enter "NTM" as a password to unlock the Natsume Sano card (No. 287). Enter "NONAT" as a password in the Japanese version of the game. Note: This also unlocks the "Solid Eye" video.

MGS4 card (No. 288)

• Enter "NEXTGEN" as a password to unlock the MGS4 card (No. 288). Enter "NO PLACE" as a password in the Japanese version of the game.

Jack card (No. 291)

• Enter "SONOFSULLY" as a password to unlock the Jack card (No. 291). The Jack card allows you to move one extra space when you move, but your attack is reduced by 20 points. This effect lasts three turns.

Solid Snake MGS4 card (No. 294)

• Enter "SNAKE" as a password to unlock the Solid Snake MGS4 card (No. 294). This card sets your equipment level to 3. It has a picture of Solid Snake with gray hair and an eye patch.

Otacon MGS4 card (No. 295)

• Enter "OTACON" as a password to unlock the Otacon MGS4 card (No. 295).

Metal Gear MK. II MGS4 card

• Enter "MK2" as a password to unlock the Metal Gear MK. II MGS4 card.

Banana Peel card

• Enter "RONALDSIU" as a password to unlock the Banana Peel card.

Emma's Parrot card

• Enter "GINORMOUSJ" as a password to unlock the Emma's Parrot card.

Gekko

• Enter "GEKKO" as a password to unlock the Gekko.

No Smoking card

• Enter "SMOKING" as a password to unlock the No Smoking card.

Possessed Arm card

• Enter "THESPANIARD" as a password to unlock the Possessed Arm card.

Solid Eye card

• Enter "TOBIDACID" as a password to unlock the Solid Eye card.

Completion bonuses

• Successfully complete the game to unlock the "Card Movies" option in the Deck Editor and Metal Gear REX and MGS 4 cards in your deck. Play a bit further (past the first part of stage 3) after completing the game once to unlock the MGS3: Subsistence pack.

• Successfully complete the game two times to unlock the Metal Gear RAY card, MGS Integral pack, MGS2 Substance pack, and Chronicle Unlimited.

Control title screen

• Use the Analog-stick to scroll up and down. Press L to change the color of the "Metal Gear Ac!d 2" text to black and remove the black pixel effect. Press R to zoom in on the title screen. Upon zooming in you will have the freedom to "scroll" the Analog-stick.

EZ Gun

• Successfully complete Arena mode half way on the Easy difficulty setting to unlock the EZ Gun.

Stealth

• Successfully complete Arena mode half way on the Normal difficulty setting to unlock the Stealth.

Running Man

• Successfully complete Arena mode half way on the Hard difficulty setting to unlock the Running Man.

G36C

• Successfully complete Arena mode half way on the Extreme difficulty setting to unlock the G36C.

Card upgrades
Upgrade the following cards to receive different ones. Note: All upgraded cards will count as a different card than the original.

• Strand will upgrade to Critical Shot.
• Equipment Lv.2 will upgrade to Equipment Lv.3.
• Bandage will upgrade to Syptic +.
• McDonnell Miller will upgrade to Liquid Snake.
• Gray Fox will upgrade to Cyborg Ninja.
• Ocelot will upgrade to Revolver Ocelot.
• Metal Gear D Revised will upgrade to Metal Gear Mk-II.
• Django will upgrade to Sabata.
• Otenko Sama will upgrade to Otenko Sama +.
• Naked Snake will upgrade to Big Boss.