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1.Create a Room
One tap creates your room. Share the code with 1-3 friends to join.
Chain Reaction
Place atoms. Trigger explosions. Capture the board. Turn-based strategy for 2-4 players.
How to Play
Simple rules, explosive strategy
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2.Place Atoms
On your turn, tap any empty cell or one you already own to add an atom.
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3.Trigger Explosions
When a cell reaches critical mass, it explodes into all neighboring cells!
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4.Chain Reactions
Explosions can trigger more explosions. One move can cascade across the entire board!
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5.Capture Enemies
When your atoms explode into an opponent's cell, you capture it. Their atoms become yours.
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6.Last One Standing
Eliminate all opponents by capturing their atoms. The last player with atoms on the board wins!
Critical Mass
2
Corner Cells
3
Edge Cells
4
Interior Cells
When a cell reaches its critical mass, it explodes — sending one atom to each neighbor. Corners explode at 2, edges at 3, interior cells at 4.
Why Players Love Chain Reaction
Turn-Based Strategy
Think carefully about each placement. One wrong move can set off a devastating chain reaction against you.
Instant Multiplayer
2-4 players per room. No accounts, no downloads — just share a link and start playing.
Visual Chain Reactions
Watch explosions cascade across the grid in real-time. Every chain reaction is animated step by step.
Works Everywhere
Desktop, tablet, phone — tap to place atoms on any device. Fully responsive grid layout.
All-time top scores
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Ready to Explode?
Create a room in one click. Share the link. Start your chain reaction.
Start Playing NowFrequently Asked Questions
How many players can play?▼
Chain Reaction supports 2 to 4 players per room. Each player gets a unique color for their atoms.
What is critical mass?▼
Each cell has a critical mass equal to its number of neighbors. Corner cells explode at 2, edges at 3, and interior cells at 4. When reached, atoms scatter to all neighbors.
How are players eliminated?▼
When an explosion hits your cell, it converts to the attacking player's color. If all your atoms are captured, you're eliminated. The last player with atoms on the board wins!
Can I play on mobile?▼
Yes! Just tap cells to place atoms. The grid is fully responsive and works great on phones and tablets.
Is Chain Reaction free?▼
Yes, 100% free to play. No account required, no ads. Just create a room, share the code, and start playing.
Chain Reaction is a free online multiplayer strategy board game for 2-4 players. Place atoms on a grid and trigger explosive chain reactions when cells reach critical mass. Built with Next.js and real-time WebSockets, it works in any modern browser with no download required. Features animated chain reactions, turn-based strategy, and player elimination. Perfect for quick strategic matches with friends.