Dozo

The name of this game means "it's your turn" in Japanese. First offered commercially in 1971 by Alexander Randolph via the Stancraft company. The game is unusual in that it can be played by two or three players, and that the players are not assigned a specific color of peg. Any peg can be played by any player on their turn, the objective being to form an equilateral triangle of any size in one color anywhere on the board. It's an entirely different challenge in strategy and visualization, an innovative blend of pattern and planning.