Check out Iwatani's original sketches: http://control-online.nl/gamesindustrie/2010/06/22/iwatani-t...

A few years ago I found this dossier (http://home.comcast.net/~jpittman2/pacman/pacmandossier.html) about Pac-Man. Jamey Pittman discusses Toru Iwatani's development journey and provides players with the most complete and detailed study of game's logic. It's a treasure trove for gamers and developers alike.