Calcudoku - Math meets Sudoku

A logic puzzle where math meets Sudoku.

Take 60 seconds to learn — let's play a tiny 3×3 together. Then climb the six difficulty tiers, from Easy 4×4 up to Master 9×9. No accounts, no ads, no IAP. Just numbers, cages, and your next best score.

Cages tell you the math. Each cage shows a target and an operator — fill it with digits that obey the clue while keeping every row and column free of repeats. Single-cell cages are gifts; the clue is the answer. Lock in answers, scribble notes, mark possibilities, and rule out impossibles.

Grab a puzzle code and try to beat a friend. Every puzzle has a short share code — paste it in, play the same board, and let your best score speak for itself. Per-size local leaderboards keep your bests honest across all six tiers.

• 6 difficulty tiers — 4×4 through 9×9
• 6-step in-game tutorial — replay any time from the menu
• 3 lives, 5 hints, time-decaying score with a life bonus
• Notes mode — mark possible and impossible candidates
• Shareable puzzle codes — challenge a friend on the same board
• Per-size best scores leaderboard
• Haptic feedback on number placement
• Plays great offline

Report bugs or share a puzzle: contact@texaspfcg.com