Start the game with the aquabug command line parameter. Then, press one of the 
keys below to activate the desired cheat.

Key - Effect
S - Toggle text shadows 
P or L - Increase or decrease text shadow gray 
O or K - Increase or decrease text shadow alpha 
I or J - Increase or decrease bitmap shadow gradient 
U or H - Increase or decrease bitmap shadow offset 
Y or G - Increase or decrease bitmap shadow alpha 
C - Toggle level cheat mode 
[Insert] or [Delete] - Change current class 
[Home] or [End] - Change current level (only for Class 4) 
[Page Up] or [Page Down] - Change current stage 
[F8] - Toggle narrow stage 
D - Toggle debug options