Probabilistic Tic Tac Toe

PlayerPosition 0Position 1Toss

This is a modified version of the tic tac toe game which uses a coin toss in every turn of a player to play on one of the two selected places. This leads to a higher chance of result in the game and makes the game a bit more fun because of the randomness of the toss result.


  1. For each turn the player should select 2 spots on the grid which they will use for the toss.
  2. The player should click toss which will make a toss between 0 and 1 and will play either of the 2 spots the player has selected.
  3. After the toss the second player should play their turn exactly the same was as the original player.
  4. The game restarts whenever any of the end game condition is met, which is same as the original tic tac toe.


The motivation of the game came when me and 2 of my research group friends (Sean Wilner and Amirhossein Aleyasin) were at a bar in St. Petersberg beach, Florida for the Sunbelt 2014 conference. To pass time we tried playing a tic tac toe game which because of its predictable nature bored us in few minutes. Then I thought of adding this randomness using a coin toss. We had some good close games. After this experience I introduced this game to few other of my friends and they enjoyed it as well. It was then that I decided to make this into a web game. I hope you all like it as well.