During the game, type Space and then "suck blue frog", and type Space again. Now you can enter one of the following combinations:
Add up to 999 in money: Alt + B List sprites: Alt + S
Edit all skills: Alt + H
Display valid movement locations: Alt + C
Memory information: Alt + F
Ego status: Alt + E
Display background and foreground objects: Alt + P
Path maker: Alt + G
Normal display: Alt + V
Exit cheat mode: Alt + Z