Sum Chain

Sum Chain - Play Online

Logic puzzle meets speed test. Sum Chain is 200 levels of number-linking chaos. Drag tiles. Make sums. Beat the clock. From small things, this HTML5 brain burner demands fast thinking.

How to Play Sum Chain

Your mission? Connect tiles so the last number equals the sum of everything before it. Clear the entire grid. Timer's ticking. Fail? Start over.

Core Mechanic: Drag and Sum

Desktop: Click and drag to link tiles. Release to submit your chain. Made a mistake? Drag back to undo. Mobile: Tap and slide. Lift your finger to lock it in. Slide back to fix errors. Rule to remember: The last tile you select is always the sum. Chain won't work unless the math adds up perfectly.

Progression: 200 Levels of Mayhem

Handcrafted puzzles. Each one harder than the last. Beat the clock? You pass. Clear fast? Earn 3 stars. Stars = bragging rights. No currency. No upgrades. Just pure skill grind across 200 levels.

Strategy: Overlap is King

Pro tip: Tiles can belong to two different chains. Use this. Build overlapping sums to clear stubborn grids. Stuck? Hit the Hint button. Warning: Clock doesn't pause. Hints cost time. Plan your move before you drag.

Key Features

• 200 Handcrafted Levels: No filler. Every puzzle designed by hand.
• Star Rating System: 3 stars for speed demons. 1 star just to survive.
• Strategic Overlap: One tile. Two chains. Big brain plays.
• Hint System: Lifeline when logic fails. But the timer keeps running.
• Clean Visuals: Minimalist number grids. Zero lag. Works on anything.

Who is Sum Chain for?

Perfect for puzzle addicts and mental math warriors. Great for quick sessions. Brutal for perfectionists chasing 3-star clears on every level.

Release Date & Developer

Sum Chain was developed by small things. Released April 14, 2026.

Controls

• Mouse (Desktop): Click and drag to connect tiles. Release to submit. Drag back to undo.
• Touch (Mobile): Tap and slide to build chains. Lift finger to submit. Slide back to undo.