Connect Four
Drop discs into a 7-column × 6-row grid and try to line up four of your colour horizontally, vertically or diagonally. Play a friend or face the AI in easy (heuristic) or hard (minimax depth 4) mode.
- Mobile-friendly
- Keyboard support
- No installs
How to play
Connect Four is played on a vertical 7-column × 6-row grid. Players alternate dropping a coloured disc into a column; the disc falls to the lowest empty cell. Red moves first against Yellow. The first player to line up four of their own discs horizontally, vertically or diagonally wins. If the board fills up without a winner, the round is a draw.
AI · Easy wins when it can and blocks when it must, but plays randomly otherwise. AI · Hard searches four moves ahead with the minimax algorithm and a positional heuristic, making it tough but not unbeatable.
Strategy tips
- Control the centre column — it participates in the most possible four-in-a-rows.
- Watch for "double threats": a single move that creates two ways to win next turn.
- Drop a piece directly on top of an opponent's threat to neutralise it.
- Odd rows matter: many winning tactics build from the bottom up.
Controls
- Click a column (top arrow or any cell in that column) to drop your disc.
- Switch between 2-player, AI Easy and AI Hard with the toggle.
- New round clears the board but keeps the running tally.
Frequently asked questions
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