Order and Chaos is a variant of the game tic-tac-toe. It was introduced by Stephen Sniderman in Games Magazine in 1981.
The game is unique in that both players, called Order and Chaos, control both Xs and Os. Order, going first, aims to get five like pieces in a row (vertically, horizontally, or diagonally) on the 6×6 board, while Chaos aims to fill the board without completion of a line of five like pieces. Once played, the pieces cannot be moved, and thus Order and Chaos can be played with pencil and paper.