Home » Play Games » Connect Four Duel
Pick a mode above and press Play. The first to connect four discs wins the round.
👆 Tap a column to drop • 🟣 You are purple, the computer is navy • ⌨️ On PC, keys 1 to 7 drop a disc • 🏆 Win streaks save in your browser
A connect 4 game you can play right here, free. This is Connect Four Duel, an original GameOLL game. Drop your purple discs into the board, connect four in a row before your rival does, and win the round. Face the computer on three levels, from a gentle Easy to a Hard that hunts double threats, or pass the device and duel a friend. No download. No sign-up. It works on your phone and your PC.
Every round is a fresh duel. The player who starts swaps each round, so the first-move edge is shared fairly. Your wins, your losses and your best win streak against the computer save in your browser, ready for the next visit.
Genre
Board · Strategy
Players
1 or 2 Players
Platform
Browser · Mobile · PC
Price
Free
In this guide
- How to play
- The rules of Connect Four
- Strategy tips that win rounds
- Computer levels and records
- Connect Four Duel FAQ
- Final verdict
How to play Connect Four Duel
The board has 7 columns and 6 rows. Discs fall to the lowest free square in a column, so where a disc lands depends on how full that column already is. That one simple rule is the whole game — and the source of all its tricks.
- Pick a mode — vs Computer or 2 Players — and, against the computer, a level: Easy, Medium or Hard. Then press Play.
- Tap a column to drop your disc. On a PC you can hover to preview the drop, or press the keys 1 to 7. Your disc falls to the lowest free square.
- Your rival drops next. Turns swap after every disc, and the panel above the board always shows whose move it is.
- Build a line of four of your discs — across, up and down, or on a diagonal. The winning four light up and the round ends.
- If the whole board fills with no line of four, the round is a draw.
- Press Play Again for the next round. The player who starts swaps every round, and the match score keeps running at the top.
Against the computer you play the purple discs. In 2 Players mode, Player 1 is purple and Player 2 is navy, and you simply pass the device after each drop.
The rules of Connect Four
The rules fit in one breath. Players take turns dropping one disc into any column that is not full. The disc falls to the lowest free square in that column. The first player to line up four of their own discs — across a row, up a column, or along a diagonal — wins the round. If all 42 squares fill first, the round is a draw.
Gravity is what makes the game deep. You cannot place a disc on a floating square: to reach a high square, the squares below it must fill first. So every drop changes what both players can do next. A winning square one row too high is safe for now — and a trap the moment anyone plays beneath it. Good players are always counting how many drops each key square still needs before it comes into play.
One fair-play rule is built into this version: the starter swaps every round. You start round 1, your rival starts round 2, you start round 3, and so on. Going first is a real edge in Connect Four, so the game shares it instead of handing it to the same player all match long.
Controls for phone and PC
| Action | Phone / tablet | PC / laptop |
|---|---|---|
| Drop a disc | Tap any square in the column | Click the column, or press keys 1 to 7 |
| Preview a drop | Watch the disc fall after your tap | Hover over a column to see a ghost disc |
| Start a new match | Tap Menu above the board | Click Menu above the board |
| Turn sound on or off | Tap the speaker button | Click the speaker button |
The computer takes its turns on its own, a moment after yours, so a full round against the computer flows like a real duel — no buttons to press between moves.
Strategy tips that win rounds
Connect Four looks simple, but it is a solved game with real strategy under the surface. These seven habits will win you rounds that luck alone would lose.
- Own the center column. The middle column touches more winning lines than any other — rows, diagonals and the center of the board all run through it. Drop there early, and drop there often. A disc in an edge column can join at most a few lines; a center disc is a threat in almost every direction.
- Block every open three. When your rival has three discs in a row with an empty square at one end, that square is a fire alarm. Drop there on your next move, or the round ends. Before any clever move of your own, always ask: can my rival win on the very next drop? If yes, stop it first.
- Build a double threat. The deadliest move in Connect Four makes two winning threats at once. Your rival can block only one, so the other wins next turn. The classic shape is three of your discs in a row on the bottom row with both ends open: whichever end they block, you play the other and connect four.
- Watch the diagonals. Most lost rounds end on a diagonal the loser never saw. Diagonals climb one square per column, so check every slope that runs through your rival's discs — especially the quiet ones that need just one more support disc underneath.
- Never fill under a winning square. If your rival would win by dropping into a square that is still floating one row too high, do not play in that column. Your disc becomes the step they needed, and their winning square comes into play on the very next turn.
- Think one drop ahead. Before you drop, ask what your disc lets your rival do. Every disc is also a platform for the enemy. If your move fills the square directly below their winning square, your clever attack just handed them the round.
- Play the long game on Hard. The Hard computer rarely blunders, so beat it with patience: trade blocks, keep the center, and wait for a double threat it cannot cover. Forcing a win against Hard is rare; building two threats at once is how it is done.
Here is the double threat in slow motion. Say the bottom row reads: empty, purple, purple, empty, empty, empty, empty — and it is your turn. Drop in the fourth column and your three discs sit in a row with a winning square on each side. Your rival must block one side. You play the other side and win. Spotting that shape two moves early is the skill that separates Hard-mode winners from everyone else.
Computer levels and records
The computer opponent thinks ahead by reading the board and scoring every line of four it could still complete. Higher levels simply look further into the future before choosing a column.
| Level | How it plays | Best for |
|---|---|---|
| Easy | Looks 2 moves ahead and plays a loose, playful move now and then. It still grabs a win when it sees one. | First games, kids and a relaxed warm-up |
| Medium | Looks 4 moves ahead. Blocks open threes and takes its own chances. | A fair, real fight for most players |
| Hard | Looks 7 moves ahead. Takes every win, blocks every threat and sets up double threats. | Strong players who rarely lose |
Your record against the computer saves in your browser: wins, losses and draws on each level, your current win streak, and your best streak, which also shows above the board. A win grows the streak, a loss resets it to zero, and a draw leaves it untouched. In 2 Players mode the match score lives at the top of the page for that duel and starts fresh with each new match.
Is Connect Four Duel free and safe to play?
Yes. The game is free. It runs fully inside this page. It asks for no name, no email and no account. It installs nothing on your device. Your records and streaks stay in your browser only.
Connect Four Duel is an original game made by GameOLL. The computer opponent plays by the same rules you do, with no hidden tricks: it never sees your next move and never cheats a disc onto the board. It just thinks further ahead on the higher levels.
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Connect Four Duel FAQ
Is Connect Four Duel free to play?
Yes. Connect Four Duel is 100% free. You play it right on this page, against the computer or with a friend. There is no download, no sign-up and no payment.
Can two people play on one device?
Yes. Pick 2 Players on the menu and pass the device back and forth. Player 1 drops the purple discs and Player 2 drops the navy discs. The game keeps the match score for you, and the player who starts swaps every round.
How do the three computer levels differ?
Easy thinks two moves ahead and sometimes picks a playful move, so new players can win. Medium thinks four moves ahead and blocks most threats. Hard thinks seven moves ahead, takes every win it can see and sets up double threats, so it plays close to perfect.
Who goes first each round?
You go first in round 1. After that, the starter swaps every round: the computer or Player 2 starts round 2, you start round 3, and so on. Going first is an edge, so the game shares it fairly.
What happens when the board fills up?
If all 42 squares fill and nobody has four in a row, the round is a draw. The match score keeps the draw on record, and you can start the next round with one tap. Draws are rare once you learn to spot diagonal threats.
Does the game save my record?
Yes, in your own browser. It keeps your wins, losses and draws on every computer level, your current win streak and your best streak. Nothing is uploaded and nothing leaves your device.
Final verdict: should you play Connect Four Duel?
Yes — if you like a duel that takes ten seconds to learn and months to master. Connect Four Duel gives you a fair computer on three honest levels, a pass-and-play mode for real-life rivals, a starter that swaps every round, and streaks worth protecting. Easy is a warm-up, Medium is a fight, and Hard will punish every lazy drop. Own the center, block the threes, build a double threat — and take the round.
▶ Play Connect Four Duel 🎮 See All Free GamesLast updated: November 4, 2026. Connect Four Duel v1.0 — the first release of our original Connect Four game, with a three-level computer opponent, pass-and-play for two players, win streaks and saved records. An original GameOLL browser game. Found a bug? Tell us in the comments and we will fix it in the next version.
