Maniac Mansion

In the NES and PC version of the game, a glitch allows the character that Ed has killed to come back as a "ghost"; the character's sprite does not appear, but can still be moved around the screen. It is possible to complete the game with this "ghost" character.

By selecting a character on the starting screen and quickly pressing start before the music starts, one of two things will happen: The selection will begin to garble into images of Dave's face, or Dave will have the selected character's music in gameplay. If the latter happens, you can switch to that character, press pause, and unpause, and then Dave's music will be playing.

Normally, the player must fix the arcade machines and wait for Dr. Fred to play them so they can read his score to open the inner lab door. However, by entering the code, "0000" in the door, the door will open, thus saving the player a few minutes of time and effort.