The Adventures of Robbo is a puzzle video game developed by xLand Games and published in 1994 by Epic MegaGames. The game was re-released under Creative Commons in 2006. The player controls Robbo though a series of mazes. Robbo travels several worlds spanning A through O each with a unique theme collecting bolts. Each world has a unique passcode for it, however the passcode is never the same from one computer or another. Source: Wikipedia, "Adventures of Robbo", available under the CC-BY-SA License.