Sony Playstation PS1, PSone Cheats
Shellshock
ShellShock, Shell Shock

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Courtesy of: gamefaqs.com

BUTTON COMBINATION CHEATS

INVINCIBLE
Start a game then quit by pressing Start + Select.
Now on the Main Title Screen, press:
Up, Up, Up, Down, Down, Down, Right, Right, Triangle.
You'll hear a sound if entered correctly.

DEBUG MODE
When the Core Design copyright screen appears, quickly press:
Up, Down, Left, Right, Down, Down, Right, Right, Square.
If successful a debug menu will appear.

PASSWORD CHEAT

EXTRA MISSION
On the Briefing screen, open the locker and enter the code:
4L2CZCQKDAABACQDB

Submitted by: Kevin M

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