There are cheat codes you can enter on the You Can Think Pad. Entering the code: "10181996" will let you play the game like if it was actually released in the late 90s. The code: "04281989" will put you in a room where you can play music tracks of the game. "11211994" will enable chaos mode, in which all NPCs will be cloned each time a notebook is collected, and in demo style, random events will occur much more often to the point where multiple events will be active at once. After you beat NULL style, you can enter the code: "09241993" which will enable debug mode.