This 3-player tic-tac-toe variant is played on a small (19-space) hex board. As in tic-tac-toe, the object is to get three of your pieces in a row. The players take turns placing pieces on the board. The design of the hex board allows an extra direction along which to form lines.
 
Although the game is fully determined (it's easy to work out all move combinations), no single player can force a win or a draw. Any two players can always prevent the third from winning.
 
This raises interesting strategic issues. When players form alliances, only one can win. Often the losing player can decide who wins by choosing which threat to block.
 
Hex-Tac-Toe comes in three board sizes with three, four, or five hexes to a side.