How to play tic-tac-toe

Tic-tac-toe

Three minutes to learn and a lifetime to draw. Worth knowing that against anyone who is paying attention, this game is a draw every time.

The board is three squares by three. One player is X and the other O, and X goes first.
Take turns claiming an empty square.
Three of your marks in a line wins: across, down, or corner to corner.
All nine squares filled with nobody in a line is a draw.

The bot here plays the game out perfectly, so it will never lose. A draw against it is a win of sorts.

Against a person or the bot. The bot needs no account and starts at once. To play a person, be rated and keep your games, you need an account: an email address and a password.
At your own pace. Every move has a deadline you both see, from five minutes to a week. A game can take an evening or it can take a fortnight.
Nothing to buy and nothing to win. No stakes, no prizes, no boosts, no undo. The only thing on offer is a place on a leaderboard, and only if you want one.
Every game can be checked. Anything decided by chance comes from the game's seed, and the seed is published the moment the game ends, so any finished game can be replayed and verified by anyone. See fair play.