Connect Four
Drop chips to connect four in a row - vs a smart AI or a friend on one screen
100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.
Your turn - drop a red chip
About this tool
Drop chips into columns to connect four in a row - horizontally, vertically, or diagonally - against a smart AI or a friend sharing the same screen. A classic strategy game that's simple to learn but has real depth for skilled play.
How to use this tool
- Choose opponentPlay vs AI difficulty level or local second player.
- Control board centerUse central columns for stronger offensive options.
- Build and block threatsCreate your own lines while preventing opponent chains.
- Convert winning setupForce unavoidable four-in-a-row finish.
Key features
- Trains foresight and counterplay decision-making.
- Simple rules with deep tactical outcomes.
- Great local strategy duel format.
- Replayable against varying AI levels.
Common uses
- Quick strategy matches with friends.
- Practicing tactical planning skills.
- Teaching turn-based game logic.
- Solo progression against stronger AI.
Tips for better results
- Think one move ahead for both sides.
- Prioritize center control early.
- Look for double-threat opportunities.
- Block immediate losing threats first.
Mistakes to avoid
- Playing only attack with no defense.
- Missing diagonal opportunities and threats.
- Dropping pieces into trap columns.
- Ignoring opponent forced-win patterns.
Frequently asked questions
Multiple difficulty levels are typically available, letting you choose an easier AI while learning strategy, or a genuinely tough opponent once you've gotten comfortable with the game.
Yes - two-player mode lets you and a friend take turns dropping chips on the same device.
Yes - stats like win streak and overall record are typically saved locally, so you can track your performance over multiple games.
Yes. Connect Four is free for normal use with no account required, and ToolBox does not add a watermark to your result.
Most tools in this category run in your browser so the file stays on your device. If a tool needs a temporary server job, files are handled for that job only and are not kept as a lasting archive.
No install needed. Open Connect Four in your browser, add your file or paste your input, then download or copy the result.
Yes on modern mobile browsers. For large files, a desktop browser is usually faster and more reliable.
Try a different quality or format setting, use a smaller input, or open a related tool (for example compress before convert). Keep a copy of the original file before replacing it.
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