OpSudoku: Math Sudoku Puzzle

OpSudoku is a fresh twist on classic Sudoku that adds arithmetic to every puzzle.

It is the 9×9 Sudoku you know - fill every row, column, and 3×3 box with 1–9 — but the grid is also split into "cages". Each cage shows a target number and an operator (+, −, ×, ÷), and the numbers inside it must satisfy that math while still following all Sudoku rules. One board, two kinds of logic.

▶ HOW TO PLAY
• Fill each row, column, and 3×3 box with the digits 1–9.
• Bold borders mark a cage with a small clue like "14+" or "8×".
• The numbers in a cage must match its operator and target.
• For subtraction and division the order does not matter (4− means the difference is 4).

▶ FEATURES
• Four difficulty levels: Easy, Medium, Hard, and Expert.
• A new Daily Challenge every day.
• Every puzzle is guaranteed to have a unique solution.
• Memo mode for jotting down candidate numbers.
• Smart hints when you get stuck.
• Mistake highlighting you can turn on or off.
• Clean, modern, distraction-free design.
• Play fully offline — no internet required.
• Track your stats and daily streak.

▶ FOR EVERY PLAYER
Whether you love number puzzles, brain training, or just a relaxing logic game to unwind with, OpSudoku gives your brain a satisfying daily workout.

Free to play. Optional in-app purchases let you remove ads and get extra hints.

Download OpSudoku and start solving!