Tic-Tac-Toe

1–9 play that square (as the board reads)1–9then1–9 free move: pick the board, then the squareEsc clear the picked boardEnter/N new game (when the board is done)

How to play tic-tac-toe

The rules you already know, for the sake of completeness:

  1. ✕ goes first, then players alternate.
  2. Claim a square by clicking it, or press its number key — the digits 1–9 map onto the board exactly as it reads, left to right, top to bottom.
  3. Three in a line wins — across, down, or diagonally. If all nine squares fill with no line, the game is a draw.

That's the whole game, and it takes about twenty seconds. Which is the honest problem with it: tic-tac-toe is solved. Two people who know what they're doing draw every single time, forever. Below the board you'll find the opponent toggle — vs. bot plays like a distracted human, perfect plays the theory (you cannot beat it, and you're welcome to spend a break proving that to yourself), and two players hands the same board to whoever's next to you.

The one that's actually a game: Ultimate Tic-Tac-Toe

Switch the toggle to Ultimate and the board becomes nine boards.

  • Each of the nine mini boards is a normal game of tic-tac-toe.
  • Win three mini boards in a line — across, down, or diagonally — and you win the whole thing.
  • The square you play decides where your opponent plays next. Take the middle square of a board, and they must play in the middle board. Take its bottom-left square, and they're sent to the bottom-left board. The board you're sent to is lit up, so you can always see where you stand.
  • If you're sent to a board that's already finished — won by someone, or full with nobody winning — you may play anywhere. That's the free move, and giving one away is usually a mistake.

The send rule is what turns this into a real game. Every move is two decisions wearing one coat: what it does here, and where it sends your opponent next. A square that wins you a local board is a bad move if it drops your opponent onto a board where they win one in reply.

Strategy for Ultimate

  • Look at the destination before you commit. Hovering a square outlines the board it will send your opponent to — the fastest habit to build, and it's most of the skill.
  • Guard the free move. Sending someone to a closed board hands them the entire grid to choose from. Sometimes it's the least bad option; it should never be an accident.
  • The center board is worth more. Like the center square in classic, it sits on four of the eight meta lines. So do the corner boards, at three each.
  • A local board you can't win is still useful. Playing there to aim your opponent somewhere harmless is a perfectly good move — sacrificing a mini board to control where the game goes next is a standard trade.
  • Watch for the double threat. Two mini boards you're one move from winning, both on the same meta line, is as decisive here as a fork is in the classic game.

Playing with the keyboard

Both games are fully keyboard-playable. 1–9 claims a square, laid out the way the board looks. In Ultimate you're normally sent to one board, so the digit means "that square, in the lit board." On a free move it takes two presses: the first digit picks the board, the second picks the square inside it, and Escape undoes the pick. When a game is over, Enter or N starts the next one.

Everything saves after every move, so you can drop a game mid-turn when your build finishes and pick it up minutes later — nothing is lost and nothing is rushed.

Frequently asked questions

Can you always win at tic-tac-toe?

No. Tic-tac-toe is a solved game: if both players play perfectly, it is always a draw. The best you can do is never lose, and punish a mistake when your opponent makes one. That's why our default bot makes occasional mistakes on purpose — it always takes a win it can see and it usually plays well, but it isn't flawless, so beating it is possible. Switch the opponent to 'perfect' and you can prove the theory yourself: it cannot be beaten, only drawn.

What is the best first move in tic-tac-toe?

The center is the strongest practical opening — it sits on four of the eight winning lines, twice as many as any corner. Against imperfect play, a corner is the best trap: if your opponent replies anywhere except the center, you can usually force a win. Against perfect play, every opening draws, so 'best' means 'most likely to be answered wrongly'.

What is Ultimate Tic-Tac-Toe?

Ultimate Tic-Tac-Toe is nine tic-tac-toe boards arranged in a 3×3 grid. You win a local board the usual way, and you win the game by winning three local boards in a line. The twist is the send rule: whichever square you play in decides which board your opponent must play in next. Play the top-right square, and they must play in the top-right board. It turns a solved children's game into a genuine strategy game — you're always choosing between the best move here and where it sends your opponent.

What happens if you get sent to a board that is already won or full?

You may play anywhere on the grid — that's the free move, and it's the rule most people get wrong. Any board that is finished is closed: a won board, and also a full board that nobody won. Being sent to a closed board frees you completely, so handing your opponent a free move is one of the worst things you can do in Ultimate. A big part of good play is avoiding it.

How do you win at Ultimate Tic-Tac-Toe?

Think one step further than the board in front of you: before you play a square, look at the board it sends your opponent to. A move that wins a local board is worthless if it sends them somewhere they win a board in reply. The three habits that beat most players are never handing over a free move, aiming your sends at boards where your opponent has nothing, and remembering the center board sits on four of the meta lines. Our bot looks exactly one move ahead — plan two and you'll beat it.

Is the bot beatable?

Yes, deliberately, in both games. The classic bot always takes a win it can see but plays a mistaken move roughly one time in seven, so an attentive player beats it regularly. The Ultimate bot wins and blocks local boards, and avoids sending you somewhere useful — but it never searches ahead, so a player who plans a couple of moves out beats it about six games in ten. Neither is trying to be a chess engine. If you want the wall, the classic 'perfect' toggle is a genuinely unbeatable opponent.

Can two people play on one computer?

Yes — set the opponent toggle to 'two players' for pass-and-play, in classic or Ultimate. ✕ always goes first. The game saves itself after every move, so a half-finished grid is still waiting if you wander off mid-game.

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