Tic-tac-toe (or “Noughts and Crosses”) is a game simple enough to implement in any computer system: indeed it’s often used in beginner’s programming courses. A more challenging project, and arguably ...

Tic-tac-toe doesn’t have much of a rep. Sure, it’s a simple, brief distraction from the monotony of existence, but once your 8-year-old self realizes that you can always force a draw, it loses its ...

Here’s another entry in the 7400 Logic contest. [Circuitchef] used gates and a few flip-flops to build a two-player electronic Tic-Tac-Toe game. The full details or shared in the PDF file he links to ...

Impossible Tic Tac Toe is the hardest version of the game around, played against an opponent leagues smarter than your little sibling. It knows every trick in the book, making it impossible to beat or ...

Up to equivalence, there aren’t nine distinct opening moves. There are only three. If it isn’t immediately clear to you what “up to equivalence” means here, I urge you to try and figure it out ...

This piece was adapted from an article originally published in 1957 by the mathematician and master puzzler Martin Gardner. For 25 years, Gardner wrote a beloved column called “Mathematical Games” for ...