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Playstation 2 - Neo Contra cheats

Extra lives: 
Press Up, Up, Down, Down, L1, R1, L2, R2, L3, R3 at the title screen. 

Music Box: Finish the game. 
Gallery: Finish the game with an "A" rank. 
Theater: Finish the game with a "B" rank. 
Best Ending: Finish level 7. 
Bill II and Jaguar II characters: Finish level 7 with an "S" rank. 
Hidden FMV sequence: Finish level 7 with an "S" rank. 
Level 6: Finish level 5 with an "A" rank. 
Level 6 Training: Finish level 6. 
Level 7: Finish level 6 with an "A" rank. 
Level 7 Training: Finish level 7. 
Weapon Set D: Finish level 5. 
Weapon Set E: Finish level 6. 
Weapon Set F: Finish level 7.