Nightmare Creatures 

Cheat mode:
Enter Left, Up, Triangle, Down, Circle, Triangle, Square, Down as a password. Unlimited continues, level select, and play as monster options will be available for the next game. 

Easy kills:
Enable cheat mode, then press L1, R1, L2, R2, Select. 
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Level
Password Ignatius
2
Triangle, Circle, Triangle, Left, Triangle, Square, X, Square 3
Triangle, X, Circle, Triangle, Triangle, Down, Square, Up 4
Triangle, Square, Triangle, Left, Triangle, Down, Up, Square 5
Triangle, Up, Triangle, Up, Triangle, Down, Down, X 6
Triangle, Down, Triangle, X, Triangle, Down, Left, Circle 7
Triangle, Left, Triangle, X, Triangle, Left, Triangle, Circle 8
Triangle, Right, Triangle, X, Triangle, Triangle, Circle, Circle 9
Circle, Triangle, Triangle, X, Circle, Circle, Square, X 10
Circle, Circle, Triangle, Right, Triangle, Up, Down, Down 11
Circle, X, Triangle, Right, Triangle, Down, Left, Down 12
Circle, Square, Triangle, Square, Triangle, Up, Triangle, Square 13
Circle, Up, Triangle, Square, Triangle, Down, Circle, Square 14
Circle, Down, Triangle, Right, Triangle, Circle, X, Down 15
Circle, Left, Triangle, Square, Triangle, Triangle, Square, Square 16
Circle, Right, Triangle, Square, Triangle, Circle, Up, Square 17
X, Triangle, X, Square, Triangle, Square, Down, Up, 18
X, Circle, X, Square, Triangle, Up, Left, Up, 19
X, X, X, Square, Circle, Down, Circle, Down, 20
X, Square, X, Square, Circle, Left, X, Down,  
Nadia
2
Up, Circle, Triangle, Left, Triangle, Square, X, Square 3
Up, X, Triangle, Up, Triangle, Square, Square, X 4
Up, Square, Triangle, Up, Triangle, Up, Up, X 5
Up, Up, Triangle, Up, Triangle, Down, Down, X 6
Up, Down, Triangle, Up, Triangle, Left, Left, X 7
Up, Left, Triangle, Up, Triangle, Triangle, Triangle, X 8
Up, Right, Triangle, X, Triangle, Triangle, Circle, Circle 9
Down, Triangle, X, X, Circle, X, Square, Square, 10
Down, Circle, X, Square, Triangle, Square, Down, Up, 11
Down, X, X, Square, Triangle, Up, Left, Up, 12
Down, Square, X, Square, Triangle, Left, Circle, Up, 13
Down, Up, X, Square, Triangle, Left, Circle, Up, 14
Down, Down, X, Square, Triangle, Triangle, X, Up, 15
Down, Left, X, Square, Triangle, Circle, Square, Up, 16
Down, Right, X, Square, Triangle, X, Up, Up, 17
Left, Triangle, X, Square, Triangle, Square, Down, Up, 18
Left, Circle, X, Square, Triangle, Up, Right, Up, 19
Left, X, X, Square, Circle, Down, Circle, Down, 20
Left, Square, X, Square, Circle, Left, X, Down,