Play Connect Four vs AI and test your tactical skills against a computer opponent that adapts to your play. Also known as four in a row online, this vertical strategy game challenges you to drop pieces, build chains, and outmaneuver the machine before it connects four first.
Choose your difficulty level first — Easy, Medium, or Impossible — then click any column to drop your piece. The piece falls to the lowest open cell, and the AI immediately responds. On Easy the computer plays casually, focusing on the center and basic blocks. On Impossible it calculates deep into the game tree to find the strongest counter.
🤖 Face a Smart Opponent
The Connect Four AI uses a search algorithm that looks ahead multiple moves, weighing each column by how much it contributes to a winning line. It prioritizes the center column, builds chains aggressively, and blocks your threats before they develop. On higher difficulties it searches deeper into the game tree, making it significantly harder to trap. All calculations happen in under a second — the AI responds as fast as you click.
⚡ Three Difficulty Levels
Easy mode uses a simple heuristic: it checks for immediate wins first, then blocks your threats, then plays the center column if available. Medium mode activates deeper search — the AI plans several moves ahead and begins setting traps. Impossible mode pushes the search to its limit, weighing positional advantage, center control, and threat detection across many future turns. Each level sees further ahead, making the AI progressively harder to outmaneuver.
🧩 Master the Perfect Trap
Winning at Connect Four is about creating overlapping threats. A common winning strategy is building two separate three-in-a-row chains at once — the AI can only block one. The key is reading the board vertically and diagonally, not just horizontally, to spot opportunities to fork the computer's defense.
A concrete dual threat: occupy columns 3 and 5 so you threaten four across the fourth row, while a diagonal from column 4 already has three of your discs. When those two wins do not share a block square, one drop finishes the game. Easy often misses the second threat. Medium blocks one line and may still leave the other. Impossible tries to stop the setup two moves earlier, which is why you have to threaten from both the center and a wing instead of stacking a single column.
Open in the center column
Drop your first piece in column 4. That cell sits in more winning windows than any other opening. The second and third moves usually stay in columns 3–5 unless you are answering an immediate three. Playing column 1 or 7 on move one wastes the extra diagonals the center would have given you. After the center is yours, look for even-row horizontal threes: because of gravity, a threat on an even row can be harder for the second player to answer if the column underneath is not yet filled. If you want the full rules, 2-player mode, and the same engine on the games hub URL, that lives at /games/connect-four. This page is the vs-AI landing: board first, then the tactics that actually beat the computer.
🎯 Game Features
- Play Connect Four vs AI on Easy, Medium, or Impossible
- Classic 7-column vertical grid with smooth animations
- Optional 2-minute timer for blitz-style matches
- Works instantly on mobile, tablet, and desktop
- No download or account required
- Responsive small-screen mode for phones
🕹️ Start Playing Now
Pick a difficulty, drop your first piece in the center column, and see how the AI responds. Free to play, no account needed.