Tony Crowther formed Wizard Developments with Roger Taylor, building on Roger and Ian Stewart’s hardware brand to develop Commodore 64 games. After Black Thunder and Gryphon, Tony released William Wobbler, published under the Wizard label.
Players that completed the game could enter a competition. What was unusual about this release was that it included a diskette for the player to enter the competition, but was included with the cassette version of the game.
So far, no-one has ever completed it ….