Way back in 1984, ED Hobbs with publishing rights by Broderbund, released the rather genius game of ' The Castles of Dr. Creep 'for the C64. It was a two player platformer with a heavy emphasis on puzzles and required the player(s) to escape from each castle through a vast network of interconnected rooms. This was made more difficult by contraptions and traps such as Conveyor belts, force fields, laser guns, mummies and Frankenstein monsters. A good game indeed, but today I've learnt that this game has appeared for PC, Mac, Linux and is currently going through a Steam Greenlight campaign.
