Tic tac toe is a two-player game on a three-by-three grid. One player is X, the other is O, and you take turns drawing your mark in an empty square. The first person to get three in a row, across, down or diagonally, wins. If all nine squares fill up with no line, it's a draw.
Here's the part most people don't know: if both players make no mistakes, every game ends in a draw. So the real skill isn't winning, it's never losing, and spotting the moment your opponent slips. Once you've got that, the game gets a lot more interesting, and the variations further down give you something new when the classic grid feels too easy.
The rules in four steps
You don't need anything special. A pen and a scrap of paper will do, or a whiteboard, or a stick in the sand.
- Draw the grid: two lines down and two lines across, so you get nine squares.
- Decide who's X and who's O. By tradition X goes first, so swap who starts each round to keep it fair.
- Take turns. On your turn, draw your mark in any empty square. You can't move or rub out a mark once it's down.
- Win or draw. Three of your marks in a straight line (row, column or diagonal) wins. If the grid's full and nobody has a line, the game's a draw, which some people call a cat's game.
That's the whole game. It takes seconds to learn, which is why it's often the first strategy game a child plays.
How to never lose
Tic tac toe is a solved game, which means the best moves for every position are known. You don't need to memorise them all. A handful of habits will carry you through almost every game.
If you're going first (X)
- Take the centre or a corner. Both are strong. The centre touches four possible lines, more than any other square, and a corner touches three.
- If you took a corner and your opponent doesn't answer in the centre, you can often build a fork. A fork is a move that creates two ways to win at once. Your opponent can only block one, so you win with the other.
- The edge squares (the middle of each side) are the weakest opening. They only sit on two lines.
If you're going second (O)
- If X takes the centre, take a corner. Taking an edge here gives X an easy path to a fork.
- If X takes a corner, take the centre. This is the move that keeps you safe.
- If X takes an edge, the centre is a safe reply.
The checklist for every single move
Before you put your mark down, run through this in order:
- Can I win right now? If you have two in a line and the third square is empty, take it.
- Do I need to block? If your opponent has two in a line with an empty third square, block it.
- Can I make a fork? Look for a square that gives you two winning threats at once.
- Do I need to stop their fork? If your opponent could create a fork next turn, block that square, or force them to answer a threat of your own somewhere else.
- Otherwise, take the centre, then a corner opposite your opponent, then any free corner, then an edge.
Follow that list and you won't lose. It sounds simple, but under a bit of pressure people skip step two all the time.
Why perfect play ends in a draw
With only nine squares, the game is small enough that every possible sequence of moves has been worked out. Whatever the first player does, the second player always has a reply that stops a line. And whatever the second player does, the first player can always avoid falling into a fork. Neither side can force a win, so two careful players always tie.
That's why grown-ups get bored of the classic version and why it's a great teaching game. Kids learn to look ahead one move, then two. Once a child can block every threat, they've learned the core idea behind chess, checkers and plenty of other games: think about your opponent's next move before your own. If you enjoy that kind of thinking, my guide to classic board games is a good next step.
Variations worth trying
When the standard grid always ends in a draw, change the rules. These versions keep the spirit of the game but give you room to win.
- Ultimate tic tac toe. Draw a big grid where each of the nine squares holds its own small grid. Where you play inside a small grid decides which small grid your opponent must play in next. Win a small grid to claim that square of the big one. It's the best upgrade for adults, and it rewards planning.
- 4x4 tic tac toe. A four-by-four grid where you need four in a row. It's harder to block everything, so games feel more open.
- Five in a row (Gomoku style). Use squared paper or a big grid and try to get five in a row. Gomoku is a traditional game played this way, and it's surprisingly deep.
- Notakto. Both players draw X only. Whoever completes a line of three loses. It turns the usual thinking upside down, and you can play it on one board or several.
- 3D tic tac toe. Stack several grids as layers of a cube. Lines can run straight through the layers or diagonally from top to bottom. You'll need to picture the cube in your head, which is half the fun.
Where to play
You don't need an app at all. Paper is still the quickest option, and it's perfect for restaurants, car journeys and waiting rooms.
Want AI doing the heavy lifting in your marketing?
I build the systems that handle the boring 80 percent, so you get your week back. Done properly, with the human kept in.
If you'd rather play on a screen, you've got a few choices:
- Google's built-in game. Search for tic tac toe on Google and a playable board appears right on the results page. You can play against the computer at different difficulty levels or play a friend on the same screen.
- Two-player phone apps. Plenty of free games let two people share one phone and take turns. My list of free two-player games on one phone has more ideas you can play without internet.
- Puzzle and game collections. Many free game bundles on Android and iPhone include tic tac toe alongside dots and boxes, connect four style games and others. Check whether they work offline before a trip by opening them once in airplane mode.
Teaching it to kids
Tic tac toe is one of the easiest games to teach, and young children pick it up fast. Here's what helps:
- Start by letting them be X and go first. Going first is the easier side.
- Play out loud. Say things like "I'm going to put mine here so you can't get three." Children copy the way you think, not just the moves.
- Teach blocking before winning. Once they spot your two-in-a-row and block it, they've got the most important idea.
- Let them win a few, then stop letting them. When they start getting draws against you, they've learned the game.
- Move on to a bigger grid or Ultimate tic tac toe when they're bored. That's a good sign, not a problem.
For quieter moments, you can mix it with simple guessing games that need no board at all. Both are great for building patience and turn-taking.
Frequently asked questions
Who goes first in tic tac toe?
By tradition X goes first. Going first is a small advantage, so it's fair to swap who starts after each game.
Can you always win at tic tac toe?
No. If both players make the best moves, the game always ends in a draw. You can only win when your opponent makes a mistake, such as missing a block or letting you build a fork.
What's the best first move in tic tac toe?
The centre or a corner. The centre sits on the most lines, and a corner gives you good chances to set up a fork. An edge square is the weakest start.
What is a fork in tic tac toe?
A fork is a move that creates two ways to win at the same time. Your opponent can only block one of them, so you win on your next turn.
How do you play tic tac toe on Google?
Search for tic tac toe on Google and a game board appears on the results page. You can choose a difficulty level against the computer or play a friend on the same device.
