How do you win at Connect Four?

Be the first to get four of your discs in a line, horizontally, vertically or diagonally. Because discs stack from the bottom, the strong idea is to build two threats at once so your opponent cannot block both. Controlling the centre column gives you the most ways to line up four.

How good is the computer opponent?

It searches several moves ahead, always takes a winning move when one is available, and blocks your winning threats. It is a genuine challenge, but it is not flawless on every board, so sharp play can still beat it.

Can I play against another person?

Yes. Switch to two-player mode and take turns on the same screen, dropping discs of your own colour. The game tracks whose turn it is and announces the winner when a line of four appears.

Is this free, and do I need an account?

It is completely free and there is no account or sign-up. You just open the page and play. There is no paid tier and no limit on how many games you start.

Connect Four

Play Connect Four free in your browser against a sharp computer opponent or a friend on the same screen. Take turns dropping discs into the columns and be the first to line up four of your colour in a row, column or diagonal. Simple to learn, and surprisingly deep once the computer starts blocking you.

Free, with no ads in the way
No sign-up, no app
Plays instantly in your browser
Scores stay on your device
Works offline after first load

Your move (Red)

You (Red)

CPU (Yellow)

6 rows, 7 columns. Drop a disc and line up four in a row, up, across or diagonally.

How to use it

1
Choose your opponent

Play against the computer, which looks several moves ahead, or pass the device back and forth with a friend.
2
Drop a disc

Click a column to drop your disc. It falls to the lowest open slot, so every move both builds your line and changes theirs.
3
Connect four

Get four of your colour in a row, up, across or diagonally, to win. Block your opponent when they get close to doing the same.

When it comes in handy

A game with a friend

Same-screen play makes it an easy two-player game with no setup and no second device.

Practising against the computer

The computer punishes loose moves, which is a good way to learn the threats you keep missing.

A fast strategy fix

Each game is short but asks you to plan ahead, so it scratches the strategy itch in a few minutes.

Free, private & 100% in your browser

The game runs right here in your browser. There is no sign-up and no limit on how many rounds you play, your scores stay on your own device, and once the page has loaded it keeps working even with no connection.

Frequently asked questions

How do you win at Connect Four?: Be the first to get four of your discs in a line, horizontally, vertically or diagonally. Because discs stack from the bottom, the strong idea is to build two threats at once so your opponent cannot block both. Controlling the centre column gives you the most ways to line up four.
How good is the computer opponent?: It searches several moves ahead, always takes a winning move when one is available, and blocks your winning threats. It is a genuine challenge, but it is not flawless on every board, so sharp play can still beat it.
Can I play against another person?: Yes. Switch to two-player mode and take turns on the same screen, dropping discs of your own colour. The game tracks whose turn it is and announces the winner when a line of four appears.
Is this free, and do I need an account?: It is completely free and there is no account or sign-up. You just open the page and play. There is no paid tier and no limit on how many games you start.