Drop discs to line up four in a row — against the computer or a friend.
🔴 Your turn
Connect Four is the classic drop-and-stack strategy game: take turns dropping discs into a seven-column grid, and be the first to line up four of your colour in a row — horizontally, vertically, or diagonally. It is simple enough for a child to learn in seconds, yet it has been mathematically 'solved', which means there is a perfect strategy — and a surprising amount of depth in getting there.
This version lets you play against a computer opponent that looks several moves ahead, or pass-and-play with a friend on the same device. It runs entirely in your browser with no download and no account, and works just as well on a phone as on a desktop.