As a collector of all games, this is the first time I've been lucky enough to find Mystery Maze by Marx Toys. This game is dated 1976 and it is still contained in its original box.
This is a LARGE game measuring 19-1/2" x 19-1/2" from side to side including handles. Game is complete with 16 glass marbles (4 white, 4 green, 4 orange and 4 yellow) and plastic game unit with lid. There are no longer any instructions but this is a skill game and although directions aren't really needed, they can generally be found online.
This game is in excellent vintage condition. The box is also in great shape although it does show normal shelf wear. Box states: Mystery Maze, #5278, Marx Toys, The Inscrutable Game of Skill and Luck. (Last picture shows under side of game unit.)