Daedalian Opus (alternative title Puzzle Road) was a puzzle game for the Game Boy released in June of 1990. It was one of the few games produced by the little-known software company Vic Tokai.
After completing each level, the player was given a password to access that level at a later time. Interestingly, each password was a common English four-letter word, so that by guessing common four-letter words, players could potentially access levels they had not actually reached by playing the game.
The name of the game was inspired by Daedalus, the mythical character of Greek legend who created the labyrinth.
A faithful fan version was later coded for the MSX computer system by Karoshi Corporation in 2006 for the game development contest MSXdev'06
The game has been ported to different platforms, such as PC and GP2X.