Contra - Shattered Soldier cheats and cheat codes for Playstation 2

Get 99 credits:
Go to the main menu and press Up, Up, Down, Down, Left, Right, 
Left, Right, Circle, Square and Select

Additional 30 lives
Go to the title screen, press Up, Up, Down, Down, L1, R1, L2, R2, 
L3, R3 on controller two.

Unlock Stage 5 in training mode
Finish stage 5 in normal difficulty mode

Unlock Stage 6
Finish stage 5 and reach "A" rank

Unlock Stage 6 in training mode
Finish stage 6 in the normal difficulty mode.

Unlock Stage 7
Finish stage 6 with an "A" rank.

Unlock Stage 7 in training mode
Finish stage 7 in normal difficulty mode.

Unlock last Boss battle in training mode
Beat the last Boss in normal mode 

Unlock Gallery option
Finish the game and reach "A" rank on the normal difficulty mode

Unlock Database option
Finish the game and reach  "B" or "C" rank on the normal difficulty mode

In-game reset:
During gameplay hold L1 + L2 + R1 + R2 + Start + Select