Connect Four looks simple — drop a disc, line up four — but underneath it is a fully solved game of traps and counter-traps. Learn a handful of ideas and you'll start beating people who just play wherever looks good.
This guide uses the standard board: seven columns across, six rows tall. On ToucanPlay you can put it into practice instantly in Connect Fruit, our jungle version, against a friend, a stranger, or the bot.
Players alternate dropping a disc into any column that isn't full; the disc falls to the lowest empty slot. The first player to line up four of their own discs in a row — horizontally, vertically, or diagonally — wins. If the board fills with no four-in-a-row, it's a draw. The catch that makes it deep: because discs stack, every move you make also changes which squares are reachable next.
If you have one rule, make it this: play the center column first, and fight for it. More winning lines pass through the middle column than any other, so controlling it gives you the most ways to make four while limiting your opponent's. In fact, the first player can force a win with perfect play only by opening in the center — start anywhere else and the advantage evaporates.
A "threat" is three of your discs that could become four. A single threat is easy to block. The winning idea is the double threat: a move that creates two separate fours-in-waiting at the same time. Your opponent can only block one, so the other wins on your next turn. Most Connect Four games are decided the moment one player sets up a double threat the other didn't see coming.
This is the idea that separates strong players. Number the rows 1 (bottom) to 6 (top). A threat sitting on an odd row is an "odd threat"; on an even row, an "even threat." Because players alternate filling a column from the bottom, the first player tends to benefit from odd threats and the second player from even ones. You don't need to calculate it perfectly — just know that where your threat sits vertically decides who actually gets to complete it when the column fills in. Aim to leave your winning gap on a row the math gives to you.
Of course you must stop an opponent's three-in-a-row. But players who only react lose, because every defensive move is a move they're not using to build their own threats. Whenever you block, look for a block that also develops your position — ideally one that creates a threat of your own.
Horizontal and vertical fours are easy to spot. Diagonals are where most games are actually won and lost, because they're the easiest to overlook — both yours and your opponent's. Before every move, scan all four diagonals running through the squares you're about to affect.
The fastest way to improve is to play. Start a game of Connect Fruit and try opening in the center every time, then hunt for double threats. Send the link to a friend, match a stranger, or warm up against the bot.
Want more? Try our other strategy classics: Checkers Canopy, Reversi Reef (Othello), and Dots & Berries — or see the best 2-player online games to play with a friend.