To activate the cheat mode, you need to press either [!] or [x].
 This depends on which version you're playing, so you will need to try
 both to see which works on what you have.
 
 Once activated, you can use these keystrokes for cheats:
 
 [Shift]+[9] then right arrow - Go to the next level
 [Shift]+[0] will give you free items