How to play Chain
Learn the rules, understand what makes a strong solve, and pick up the planning habits that lead to clean lines.
Read guideAbout the game
Chain is built around three actions you can learn immediately: reverse the digits, multiply by 2, and add 3. That small ruleset keeps the puzzle approachable while still producing boards that reward planning.
The daily puzzle is the main event. Practice mode is there when you want more reps, but the live daily challenge stays the centre of the experience.
Most strong solves come from understanding when to reshape the number and when to grow it. Flip is often the move that changes everything, but only if you set it up well.
That makes Chain feel different from a straight arithmetic drill. The game is about path quality, not just reaching the target eventually.
Chain Example
Turn 13 into 61
Learn the rules, understand what makes a strong solve, and pick up the planning habits that lead to clean lines.
Read guideUnderstand the longer chains, tighter limits, and how resource discipline changes the way you play.
Read guideLearn what separates a Perfect solve from a Sharp or Scrambled one, and how the optimal move count is calculated.
Read guideChain is a browser-based daily number puzzle. Every day starts with a fresh start number and target number, and everyone gets the same three operations.
No. The puzzle is more about planning and pattern spotting than heavy calculation. You only reverse digits, multiply by 2, and add 3.
Yes. Practice mode gives you unlimited extra puzzles while keeping the daily puzzle separate.
Chain compares your move count to the shortest possible path. Match the optimal count and you get Perfect. Use one extra move and you get Sharp. Any more and it is Scrambled.
Hard Mode uses longer puzzles with an 8 to 12 move optimal path, raises the move limit to 30, and caps undos at 5 and resets at 3. It is designed for players who want more resource pressure.
Chain does not have a public archive. You can review the previous day's puzzle and its optimal solution via the Yesterday button.