Unlock Solid Snake (MG) Card:
Complete the Game Once.

Unlock Raiden Card:
Complete the Game twice on any difficulty.


Bonus Cards
At the 'Main' menu select 'Password' and enter the following codes

Card No. 173 - Viper Viper

Card No. 178 - Mika Slayton Mika

Card No. 182 - Karen Houjou Karen

Card No. 184 - Jehuty Jehuty

Card No. 199 - XM8 Xmeight

Card No. 200 - Kosaka Yuka (Japanese version only) Sabrage

Card No. 201 - Yoshida Asaki (Japanese version only) Nomel

Card No. 202 - Saitou Yuu (Japanese version only) Elyts

Card No. 203 - Shibuya Eri (Japanese version only) Maeb

Card No. 201 - Asaki Yoshida (US Version) umeda

Card No. 200 - Kosaka Yuka ( US version only) Kobe

Card No. 203 - Shibuya Eri (US version only) Roppongi

Card No. 202 Yu Saito (US version only) YEBISU


Unlock - Link Battle (US Version Only):
Clear Stage 06 and Link Battle becomes available in 'Options' via Intermission.

Unlock Characters

Character 23:
Acquire 50 deletes in Time Attack 60.

Character 24:
Acquire 150 deletes in Time Attack 180.

Character 25:
Acquire 250 deletes in Time Attack 300.

Character 38:
Acquire 500 deletes in Time Attack 600.

Character 39:
Successfully beat Level 1 in versus the CPU.

Character 40:
Successfully beat Level 2 in versus the CPU.

Character 41:
Successfully beat Level 3 in versus the CPU.

Character 42:
Successfully beat Level 4 in versus the CPU.

Character 43:
Successfully beat Level 5 in versus the CPU.

Character 44:
Successfully beat Level 6 in versus the CPU.

Character 45:
Successfully beat Level 7 in versus the CPU.

Character 46:
Successfully beat Level 8 in versus the CPU.

Character 47:
Successfully beat Level 9 in versus the CPU.

Character 48:
Successfully beat Level 10 in versus the CPU.


Unlock Skins

45 Degrees:
Finish all the normal puzzles in Puzzle Mode.

Aback:
Reach Level 40 in Challenge Mode.

Auto Mobile Industry:
Complete Level 2 versus the CPU.

Big Elpaso:
Reach Level 70 in Challenge Mode.

Brash:
Complete Level 8 versus the CPU.

Chinese Restaurant:
Complete Level 9 versus the CPU.

Da-Di-Do:
Reach Level 52 in Challenge Mode.

Dark Side Beside The River:
Complete Level 36 in Challenge Mode

Fly Into The Sky:
Reach Level 95 in Challenge Mode

Get up and go:
Reach Level 90 in Challenge Mode

Holiday In Summer:
Reach Level 60 in Challenge Mode

I hear the music in my Soul:
Reach level 32 in Challenge Mode

Japanese Form:
Complete Level 1 in VS. CPU.

Just:
Reach Level 28 in Challenge Mode.

Lights:
Reach Level 100 in Challenge Mode.

Meguro:
Reach Level 80 in Challenge Mode.

Mekong:
Complete Level 5 in VS. CPU.

Moon Beam:
Complete Level 10 in VS. CPU.

Morning Beats:
Unlocked by 20 hours of play time.

My Generation:
Reach Level 75 in Challenge Mode

Please Return My CD:
Complete Level 3 in VS. CPU.

Prime Factor:
Complete all x2 puzzles in Puzzle Mode.

Rodent:
10 hours of play time.

Round About:
Reach level 8 in Challenge Mode.

Shake Ya Body:
Reach level 16 in Challenge Mode.

Sister Walk:
Reach Level 48 in Challenge Mode.

Slipping:
Reach Level 12 in Challenge Mode.

Spirits:
Reach Level 85 in Challenge Mode.

Square Dance:
Reach level 20 in Challenge Mode.

Strangers:
Reach level 56 in Challenge Mode.

Take A Dog Out A Walk:
Reach level 65 in Challenge Mode.

Talk 2 You:
Reach level 24 in Challenge Mode>

The Bird Singing In The Night:
Complete level 4 in VS. CPU.

The Spy Loves Me:
Reach level 7 in VS. CPU.

Tin Toy:
Clear versus the CPU.

Urbanization:
Reach level 4 in Challenge Mode.

Water, Flower & Lights:
Finish with 999,999 in Challenge Mode

Whoop-De-Do:
Beat level 6 in VS. CPU

Working In The Hole:
Reach level 44 in Challenge Mode

Unlock Multiplayer with Wi-fi:
Complete Stage 6, the Residential Area - Teliko has joined the mission. Go to the options during the intermission menu and Link Battle is now available. Link two PSPs through AD-hoc then go head to head while controlling Snake and Teliko.

Raiden Card:
On any difficulty complete the game twice

Solid Snake Card:
Complete the game once

Viper:
Gives you Viper card 173

Mika:
Gives you Mika Slayton Card 178

Karen:
Gives you Karen Houjou card 182

Jehuty:
Gives Jehuty card 184 – destroys all equipment in a room

Xmeight:
Gives you card 199

Kobe:
Gives you card No.200, Yuka Kosaka

Umeda:
Gives you card No.201, Asaki Yoshida

Yebisu:
Gives you card No. 202

Roppongi:
Gives you card No.203, Eri Shibuya


The following four codes are for the Japanese version only

Sabrage:
Gives you card 200

Nomel:
Gives you card 201

Elyts:
Gives you Card 202

Maeb:
Gives you Card 203