Added Construction Time:
Hit pause at the beginning of a level and go to the stop watch symbol. Now press and hold L1 until the indicator reaches the left of the bar. You now have extra time to build your rooms.

Clean Hospital:
To get a clean hospital, save the game and reload it again when the hospital becomes full. All of the garbage and patients will dissapear, allowing a fresh start!

No More Rats:
If there are rats in your hospital, just put a plant in front of the hole.

Skip Level:
On the fax screen put in 24328 into the phone numeric keypad to access the cheat mode. Typing in 7287 will also take you to a special rat-shooting level after you've completed your current level.

Level Passwords:
Level 2:X, Circle, Square, Triangle, Triangle, Circle, Square, X.
Level 3:Circle, Circle, Triangle, Square, X, Triangle, Circle, Triangle.
Level 4:Square, Triangle, Circle, Square, X, X, Triangle, Circle.
Level 5:Circle, Triangle, Square, Circle, X, Triangle, Circle, Square.
Level 6:Square, Triangle, Square, Circle, X, Square, X, Circle.
Level 7:Square, Triangle, Triangle, Circle, X, Square, Triangle, Circle.
Level 8:X, Triangle, Square, Circle, Triangle, Circle, Square, X.
Level 9:Triangle, Square, X, Triangle, Circle, X, Triangle, Square.
Level 10:Circle, Square, X, Triangle, Square, X, Circle, Square.
Level 11:Triangle, Circle, Square, Circle, Triangle, Square, Circle, X.
Level 12:Circle, Square, X, X, Square, Circle, Square, Triangle.

1,000,000
Enter "DCKING" as a case-sensitive name at the beginning of the game to start with 1,000,000.

Extra building time
Pause game play when starting a new level. Highlight the stop watch and hold [L1] until the left side of the time remaining meter is reached.