Probabilistic Tic-Tac-Toe
Please see the associated Hacker News comments for discussion related to this game, including an algorithm for optimal play presented by Louis Abraham.
Probabilistic Tic-Tac-Toe launched on June 10, 2024 with 293 votes, #140 of 4,672 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Probabilistic Tic-Tac-Toe is a game that combines the classic tic-tac-toe rules with probability mechanics. Players compete in a variant where chance elements influence gameplay outcomes. The game is designed for anyone looking for a twist on the traditional strategy game. It offers a fresh take on a familiar format by introducing uncertainty and probabilistic decision-making into each match.
written from the facts on this page · September 2026
From the sources
Please see the associated Hacker News comments for discussion related to this game, including an algorithm for optimal play presented by Louis Abraham . The rules are the same as normal tic-tac-toe, but each square has a different probability of a good (smiley face), neutral (meh face), or bad (frowny face) event happening when selected. Good events place your mark (X or O) in the square. Bad events place your opponent’s mark. Neutral events do nothing but pass the turn to the opponent. Click in the top left to choose between 1x, 2x, and 3x speed for animations. Click in the top right to go to the settings menu. Here you can switch between singleplayer and multiplayer modes, choose the…from csun.io
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