Type iamacheater at the main menu to enable cheat mode. Then, enter one of the following codes at the indicated screen to activate the corresponding effect.

Effect
 Screen
 Code 
 
Level select
 Main menu
 [Ctrl] + L
 
Complete current level
 Game play 
 [Ctrl] + W
 
Complete entire game
 Level selection 
 [Ctrl] + W
 
Win
 Game play
 [Ctrl] + V