A, R, Z, control pad up, control pad up, up-C, down-C, and down-C
All Missions
B, Z, C-Up, C-Left, C-Left, C-Right, C-Right, C-Right,
Debug Mode
Z, Down, Up C, Left C, Left C, Left C, Left C, Down C
Horror Mode
A, B, Z, Z, C-Up, C-Right, C-Right, C-Down
Infinite Lives
A,R,Z,Right,c-up,c-right c-down,c-down
Infinite Primary Weapon
B,B,Z,Left,Left,c-up,c-left,c-right
Infinite Secondary Weapon
B, L, L, Z, Up, Down, C-Up, C-Up
Infinite Solaris
A, B, L, Up, Up, C-Up, C-Up, C-Right
Infinite Titans
L,Z,Left,Right,Down,Down,c-down,c-down
Infinite Weapon Energy
A, Z, Z, control pad up, control pad left, left-C, left-C, and down-c
Invincibility
B,B,B,L,R,Left,Down,Down
One-Shot Kills
A, R, LEFT, RIGHT, DOWN, C UP, C LEFT, C DOWN
Psychidelic Mode
Up, Up, Up, Up, Right, Down, C-Left, C-Left
Stealth Mode
R,Z,Right,Right,C-up,C-left,C-right, C-down
Stop Enemies Cold
A, Right button, Left, Right, Down, Up C, Left C, Down C
Trip Mode
B, B, Right button, Up, Left, Down, Up C, Left C
Unlimited Nitro
Left button, Left button, Right button, Z, Left, Right, Up C, Right C
Wire Frame Mode