Play Connect Four against the computer in your browser. Drop discs, line up four in a row, outsmart a minimax AI on three difficulties. Free, no install.
Tap a column to drop your disc. Connect four of your discs in a row — horizontally, vertically or diagonally — before the computer does.
Connect Four is the vertical strategy game that turns a simple idea — drop a disc, make a line of four — into something genuinely deep. Milton Bradley sold the first plastic grid in 1974, though the underlying game is much older. Its lasting appeal is that the rules take five seconds to learn and a lifetime to truly master.
The board is a standing grid of seven columns and six rows. You and the computer take turns dropping discs; gravity pulls each one to the lowest free slot in the column you choose. The goal is to line up four of your own discs in a row — horizontally, vertically or on either diagonal.
What makes it sharp is the double threat. Strong play is not about chasing one line of four; it is about building positions where you threaten to win in two places at once, so your opponent can only block one. The computer here uses a minimax search to do exactly that — and to stop you doing it.
Take turns dropping discs into the seven columns. Each 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.
Just tap or click the column you want. Your red disc drops into the lowest free slot of that column, then the computer takes its turn.
The computer uses a minimax search with alpha-beta pruning. Easy looks two moves ahead, Medium four, and Hard six — enough to spot your threats and set up its own.
On Medium and Hard, yes — its search is deep enough to see your immediate winning threats and block them. The way to win is to create two threats it cannot block at once.
You always move first, playing the red discs. Going first is a genuine advantage in Connect Four, so use it.
Yes. Your wins, draws and losses against the computer are stored in your browser and add up across every game you play.
Every win earns coins — more for win streaks and for beating harder opponents. Spend them in the Themes shop to unlock alternate board and disc colours like Midnight, Sunset and Forest. Your coins, streak and unlocks are saved in your browser.