How to Play Tic Tac Toe: Rules, Examples and Beginner Strategy

Tic tac toe takes about thirty seconds to learn and a surprisingly long time to stop losing at. This guide covers the rules properly, walks through a real game one move at a time, and shows the beginner mistakes that decide most matches.

What is tic tac toe?

Tic tac toe is a two-player game on a 3×3 grid of nine squares. One player marks squares with X, the other with O, and they take turns until one player has three of their own marks in a straight line — or until the grid fills up with nobody having managed it. X always moves first.

That is the entire game. There are no cards, no dice and no hidden information: both players can see everything at all times.

What you need

Two people, nine squares and something to write with. That is genuinely it — the grid is usually drawn as two vertical lines crossed by two horizontal lines, which produces nine boxes without needing an outer border.

If you would rather not draw anything, you can play tic tac toe online here against the computer or with someone sitting next to you.

The rules

1. Draw the grid. Three squares across, three down, nine in total. Every square starts empty.
2. Choose marks. One player takes X, the other takes O.
3. X moves first. X writes an X in any empty square.
4. Take turns. Players alternate, placing exactly one mark per turn in any square that is still empty.
5. Marks are permanent. You cannot move a mark you have placed, and you cannot overwrite your opponent’s.
6. Three in a line wins. The first player to get three of their own marks in a row, a column or a diagonal wins immediately, and the game stops there.
7. A full board with no line is a draw. Neither player wins.

Rule 6 is worth reading twice: the game ends the instant a line is completed. There is no “best of the remaining squares” and no continuing to fill the board.

A game, move by move

Here is a complete sequence. Follow it on paper and it will make more sense than any amount of description.

Move 1 — X takes the centre. The middle square is the strongest opening, and the next section explains why.

Move 2 — O takes a corner. With the centre gone, a corner is O’s best reply.

Move 3 — X takes the far corner. X now has the centre and one corner.

Move 4 — O threatens the top row. O has two marks along the top with the third square open. If X ignores this, O wins next turn.

Move 5 — X blocks, and threatens back. X fills the open top-row square. That kills O’s threat, and because the blocking square also sits on the middle column, X now has two marks on that line with the third open. O is forced to defend, and the game keeps going.

Notice what happened on move 5: X did not just defend. The blocking square was chosen because it also built something. That single habit is the difference between a beginner and someone who is hard to beat.

All the ways to win

There are exactly eight winning lines on a 3×3 grid, and it helps to know them by sight rather than hunting for them each turn.

• Three rows — top, middle, bottom
• Three columns — left, middle, right
• Two diagonals — corner to opposite corner

Number the squares 1 to 9 reading left to right and top to bottom, and the eight lines are: 1-2-3, 4-5-6, 7-8-9, 1-4-7, 2-5-8, 3-6-9, 1-5-9 and 3-5-7.

Count how often each square appears in that list and something useful falls out:

• The centre (square 5) appears in four lines
• Each corner (1, 3, 7, 9) appears in three
• Each edge (2, 4, 6, 8) appears in only two

That is the whole basis of tic tac toe strategy, and it comes straight from the geometry rather than from anything you have to memorise.

What counts as a draw

If all nine squares are filled and neither player has completed a line, the game is a draw. Some people call it a “cat’s game”.

Draws are not a failure state — they are the normal result. Between two players who are both paying attention, almost every game of tic tac toe ends level. That is a mathematical property of the game, not a sign that either of you played badly.

Beginner strategy that actually helps

You do not need theory to stop losing. You need three checks, in this order, every single turn:

1. Can I win right now? Look for a line where you already have two marks and the third square is empty. If one exists, take it. The game ends and you have won.
2. Can my opponent win next turn? Same check, from their side. If they have two in a line with the third square open, take that square. You have no choice — anything else loses.
3. If neither, take the strongest square available. Centre first, then a corner, then an edge.

Most beginner losses come from skipping step 2 while excited about step 3.

For an opening: take the centre if it is free. If your opponent has already taken it, take a corner rather than an edge.

Five common mistakes

Building your own line while your opponent is one move from winning. This is by far the most common way to lose. Check their threats before you check your plans.

Playing an edge square early. Edges sit on only two winning lines. Early in the game, a corner is almost always the better choice.

Blocking with a move that does nothing else. When two different squares both block the same threat, pick the one that also gives you two-in-a-line somewhere.

Missing a diagonal. People scan rows and columns naturally and forget the two diagonals. More surprise losses come from diagonals than from any other line.

Assuming a draw is a mistake. If both of you are playing properly, a draw is the correct result. Chasing a win from an equal position is how you hand over the game.

Practise against a computer

Reading about the three checks is one thing; doing them under time pressure is another. The easiest way to build the habit is to play a few rounds against the computer — on Medium, it will punish you every time you leave a threat unblocked, but it cannot see a fork coming, so there is a real path to winning.

When you can beat Medium reliably, try Hard. It plays perfectly, so a draw is the best result available. Getting one means you did not make a single error.

Where to go next

Once the rules are second nature, the interesting question is how to actually win rather than draw. That takes a specific tactic called a fork, which is covered in the strategy guide below.

Frequently asked questions

How many squares does a tic tac toe board have?

Nine, arranged in a 3×3 grid. Each square can hold one mark, so a game lasts at most nine moves. X makes five of them and O makes four, because X always goes first.

Can you move a mark once it has been placed?

No. Once a mark is written into a square it stays there for the rest of the game. You also cannot place a mark on a square your opponent has already taken. Every move is permanent, which is what makes the early moves matter so much.

Does X always go first?

By convention, yes, and every version of Tic Tac Toe follows it. When you play a series it is fairer to swap who takes X between rounds, because moving first is a genuine advantage — X places five marks to O's four.

Is tic tac toe the same as noughts and crosses?

Yes. "Noughts and crosses" is the British and Irish name and "tic tac toe" is the American one. The nought is the O and the cross is the X. The grid, the rules and the eight winning lines are identical.

• tic tac toe rules
• beginners
• noughts and crosses
• how to play