Chain Calc

Chain Calc is a 60-second math puzzle where you can't choose the operators.

Tap number tiles to build a chain. The operators alternate automatically — first +, then ×, then + again. Hit the target number exactly and the tiles you used are replaced; overshoot and your chain is discarded (no penalty — just start again). Every correct answer adds bonus seconds. How many targets can you clear before time runs out?

Every target is guaranteed solvable — the game verifies a valid chain exists before showing it to you.

How to play

• Tap / click tiles to chain them: first tile → + → second tile → × → third tile → …
• Match the target exactly to score. Overshooting discards the chain (no penalty).
• Correct answers add +3 seconds. Beat your best score!

Features

• Plays in your browser, on desktop and mobile (tap-only controls)
• 1–3 minute sessions, instant retry
• No downloads, no ads, no accounts
• English / 日本語

About this game: Made with AI + code by Tsuzuri Works. All graphics and sounds are procedurally generated in code (no external assets). AI usage is declared in the AI generation disclosure.

Chain Calc は「演算子を選べない」60秒の計算パズルです。

数字タイルをタップしてチェーンを作ると、演算は + → × → + … と自動で交互に切り替わります。 目標数ぴったりで正解、超えたらチェーン破棄(ペナルティなし)。

正解でタイルが補充され、残り時間が+3秒。時間切れまでに何問解けるか挑戦してください。