Puzzle competitions

annual international puzzle competition

British quiz show

Swordquest is a series of action-adventure video games developed and published by Atari, Inc. in the 1980s for the Atari 2600. It was developed as part of a contest, consisting of three finished games, Earthworld, Fireworld and Waterworld (with these titles occasionally appearing on cartridge labels and boxes with capitalized central Ws, e.g. EarthWorld), and a planned fourth game, Airworld.

tiling puzzle of 209 pieces, with large number of possible attempts

puzzle competition released in 2007, published by Lord Christopher Monckton, marketed and copyrighted by TOMY UK Ltd.; a 2 million USD prize was offered for a solution, but the competition ended in 2010 with no solutions found