A game inspired by the Four Colour Theorem in which four shapes in four colours are placed in a virtual grid according to four constraints. Players take turns to put pieces on the board, according to the following constraints: Connected: after the first piece, each piece you play must touch at least one other piece orthogonally. Different move: you may not play the same shape or colour that your opponent just played. Not adjacent: you may not place a piece adjacent to a piece of the same shape or colour. Virtual grid: you may not play so that the playing area exceeds 9 squares in any direction. The last player able to place a piece wins. Four won (along with Veletas) the BoardGameGeek Best Combinatorial 2-player Game of 2013 award. http://www.boardgamegeek.com/geeklist/168513/best-combinatorial-2-player-game-of-2013-results