N2O: Nitrous Oxide cheats and cheat codes for Playstation

Select any level
Enter Square, O, X, Triangle, Triangle, X, O, X as a password. 
or
Enter Square, Triangle, O, Triangle, X, Triangle, Square, X 
as a password. 

H.o mode
Enter O, X, Square, Triangle, Triangle, O, Triangle, O

Firewalls
Enter X, X, Square, X, X, X, Triangle, Triangle

No bonus points reset
Enter Square, Triangle, X, Triangle, O, Square, Triangle, X

Hidden ship
Enter X, X, X, Square, Triangle, O, X, Triangle

Unlimited lives
Enter O, X, X, Triangle, Square, Triangle, Square, O

Weapons
Enter Square, X, O, Square, X, Square, O, Square

Bonus stage select
Enter Square, Square, Square, Triangle, O, Triangle, Square, Square 

Deactivate all cheats
Enter Square, Square, X, O, O, O, O, Triangle

Level Password 
Level 3 - O, X, O, O, Square, Triangle, X, Triangle  
Level 4 - O, O, Triangle, O, Triangle, O, Square, Square  
Level 5 - Square, Triangle, Square, Triangle, Square, Triangle, Triangle, O  
Level 6 - Square, Square, O, Square, Triangle, X, Triangle, X  
Level 7 - X, Triangle, O, Square, X, Triangle, O, Triangle  
Level 8 - Square, O, O, Triangle, Triangle, Square, Triangle, Square  
Level 9 - Square, O, X, Triangle, Square, Square, X, O  
Level 10 - X, Triangle, Square, O, Triangle, X, X, X  
Level 11 - O, Square, Triangle, Square, O, Triangle, Square, Triangle  
Level 12 - O, X, X, X, Triangle, X, X, Square  
Level 13 - Square, Triangle, Triangle, O, O, X, O, O  
Level 14 - Square, Square, Triangle, O, O, Triangle, O, X  
Level 15 - O, Triangle, X, Square, O, Triangle, Triangle, Triangle  
Level 16 - O, Square, Triangle, X, O, O, O, Square  
Level 17 - X, O, Triangle, X, Square, Square, Square, O  
Level 18 - O, Triangle, O, O, Triangle, Square, Square, X  
Level 19 - Square, X, O, Square, O, X, X, Triangle  
Level 20 - O, Square, Triangle, Square, Square, Square, Square, Square  
Level 21 - O, O, O, O, Triangle, X, Triangle, O  
Level 22 - O, X, O, Triangle, X, O, Triangle, X  
Level 23 - Square, Square, Triangle, O, Triangle, X, O, Triangle  
Level 24 - O, O, Square, Triangle, Square, Triangle, Triangle, Square  
Level 25 - O, X, Triangle, X, Square, Triangle, X, O  
Level 26 - Square, O, O, O, X, O, X, X  
Level 27 - Square, Square, Triangle, O, X, X, Square, Triangle