How to Play Chain Reaction
Chain Reaction is a fast-paced word puzzle game where you race against the clock — and sometimes a real opponent — to fill letter slots and complete a chain of connected words. Every letter counts. Every second matters.
The Basics
Each puzzle gives you a series of letter slots arranged in a chain. Your goal is to discover words that fit the slots and connect with each other — filling in the chain before time runs out. Words link together through shared letters at their boundaries, creating a satisfying cascade of connections when you get it right.
Letters you enter appear in real time. When you complete a valid word that fits its slot, the letters lock in and your score jumps. Complete the whole chain and you trigger a Chain Reaction — a bonus cascade that rewards speed and accuracy.
Scoring
Points are awarded based on several factors:
- Word length: Longer words score more points per letter.
- Speed: Finishing faster earns a time bonus multiplier.
- Chain completion: Completing the full chain triggers a bonus.
- Streak bonus: Playing consecutive days increases your daily score multiplier.
- Word rarity: Uncommon words that use the slots cleverly score higher.
The leaderboard tracks top scores for each game mode. Weekly competitions reset every Monday, so there is always a fresh shot at the top spot.
Game Modes
Daily Challenge
One puzzle, updated every day at midnight. Everyone in the world plays the exact same chain. Compare your score on the global leaderboard and see how you rank.
Weekly Challenge
A longer, more complex chain that runs all week. Points accumulate across your attempts — so come back each day to improve your standing before the reset.
Story Mode
Pick an avatar and battle your way through a roster of 19 AI characters, each with unique speed, strategy, and personality. Play it as Normal chains, Avalanche, or Chain Duel — each with its own independent save.
Chain Duel (PvP)
Challenge a friend or get matched with a random opponent. Take turns extending a shared word chain — from a 25-second quick match up to a 24-hour async game.
Community Puzzles
Play puzzles created by other players, or build and share your own. Rate the puzzles you enjoy — the best ones rise to the top.
Power-Ups
Power-ups work a little differently depending on where you're playing:
- Chain, Avalanche, Daily & Weekly: Hint reveals a letter, Time Freeze pauses the countdown for a few seconds, and Point Attack gives your next word a score boost, and earned Double Score rewards can double your next score in any mode.
- Story Mode battles: Double Score, Time Boost (+10 seconds), Ghost Word (skip the required starting letter), and Word Bomb (cut your opponent's score by 20%). Some characters also carry a unique Hero Disruptor — a one-of-a-kind special move tied to that character.
- Chain Duel: Each player starts with two random disruptors drawn from seven types (Trap, Twist, Long Word, Short Word, Reversed, Vowel Rush, Skip Letter). Deploy one alongside your word to force a constraint on your opponent's very next play.
Power-up inventory is earned through daily challenges, streak milestones, and Story Mode victories. Use them wisely — they don't replenish automatically.
Story Mode — In Depth
Story Mode pits your chosen avatar against a fixed sequence of 19 other characters, each with their own avatar, personality, and difficulty level, escalating from an easy opening run to a final boss. You can run Story Mode as three separate campaigns — Normal, Avalanche, and Chain Duel — each with its own independent save, so progress in one never touches the others.
Ten of the twenty characters are heroes: unlocked from the start and available to pick as your avatar right away. Beat one in a Story Mode run and they join your team. The other ten are villains — locked avatars you unlock by defeating them.
Some hero characters carry a unique Hero Disruptor — a signature special move (like stealing time off the clock or zeroing out your opponent's next word) that's exclusive to that character.
Every opponent has a mood system that reflects the match state in real time. When you pull ahead, your opponent becomes visibly frustrated. When they are dominating, they look confident. Keep an eye on the in-game portrait — a flustered bot can be a sign your strategy is working.
Chain Duel PvP — In Depth
Chain Duel is Chain Reaction's turn-based multiplayer mode. You and your opponent take turns adding words to a shared chain — each word must start with the last letter of the one before it — and points are earned for word length plus a speed bonus.
Pick your own pace with a turn duration: Quick (25 seconds) or 1 Minute for a fast live match, or 1 Hour, 12 Hours, or 24 Hours for a relaxed async game you can check back on whenever you like.
You can challenge friends directly using a Friend Code, or enter the matchmaking queue to be paired with a player at a similar skill level based on your Elo rating. After three duels in a row, a brief ad plays before the next match.
Quick, 1 Minute, and 1 Hour duels contribute to your win/loss record and global Elo ranking, and support series wins (best-of-three or best-of-five) for a longer competitive session. 12-hour and 24-hour duels are single, unranked async games with a match length you choose yourself.
Daily Streaks
Playing the Daily Challenge every day builds your streak. Longer streaks unlock score multipliers and earn you bonus inventory items. Missing a day resets your streak, so set a reminder and keep the chain alive.
The app sends an optional push notification (Android) each day when the new Daily Challenge goes live, so you never miss your streak.
Leveling Up
Every game you play earns XP toward your player level — regular games, Daily and Weekly Challenges, Chain Duel matches, and Story Mode battles all contribute. There are 10 levels, from Novice up to Wordsmith Elite, each requiring more cumulative XP than the last. Your level and progress bar are shown on your profile.
Tips for New Players
Start with the anchor letters. Each slot boundary shows a shared letter. Lock in what you know at the edges first, then fill the middle.
Short words are underrated. A three-letter word that snaps into place in one second is worth more than a long word you spend eight seconds second-guessing.
Save power-ups for Story Mode bosses. The final few opponents in a Story Mode run are significantly faster than the earlier ones. A well-timed Time Boost or Word Bomb can turn a loss into a win.
In Chain Duel, watch the score delta. If your opponent jumps ahead early, deploy a disruptor immediately rather than waiting — disruptions have more psychological impact when the opponent is on a roll.
Ready to Play?
Chain Reaction is free to play on web and Android. No download required to play in your browser — just open the game and start chaining.