🎮 FREE ONLINE SUDOKU • 10,000+ GENERATED LEVELS

Sudoku Game for Kids, Students & Puzzle Lovers

Choose your difficulty and timer, start a fresh puzzle, use notes and hints, check answers, track your progress and celebrate your final score.

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Press “Start New Game” before entering answers.

Complete DigiSadhan Sudoku Practice Guide – 10,000+ Levels

Sudoku is a classic 9×9 logic puzzle. The goal is to place digits 1–9 so that each row, each column and each 3×3 box contains every digit exactly once. This game follows the standard 9×9 Sudoku structure.

Sudoku Rule: Each ROW + each COLUMN + each 3×3 BOX must contain 1, 2, 3, 4, 5, 6, 7, 8 and 9 exactly once.

How to Play Sudoku

  1. Press Start New Game before attempting answers.
  2. Select a difficulty and timer before starting.
  3. Tap a blank square and select a number.
  4. Use Notes when you want to record possible candidates.
  5. Use Check to verify the selected entry. Correct and incorrect moves receive different animations and sounds.
  6. Complete all blank cells to finish the level and receive your final score.

Difficulty Levels

EasyMore clues and beginner-friendly solving.
MediumBalanced challenge for regular practice.
HardFewer clues and more deduction.
ExpertVery few clues and advanced logical solving.
10,000+Levels are generated from deterministic seeds and shuffled puzzle patterns.

Scoring Formula

Score = Base Level Score + Completion Bonus + Speed Bonus − Mistake Penalty − Hint Penalty

The exact score is designed for game practice rather than an official competition rating. Completing a puzzle correctly, making fewer mistakes and using less time generally produces a higher score.

Sudoku Solving Strategies

1. Scan rows: Look for rows missing only a few numbers. 2. Scan columns: Identify digits that have only one possible position. 3. Scan boxes: Work inside each 3×3 box and eliminate digits already present in its row and column. 4. Naked singles: If only one candidate fits a cell, place it. 5. Hidden singles: If a number can occur in only one cell of a row, column or box, place it. 6. Candidate pairs: When two cells in a unit contain the same two candidates, those candidates can be removed from other cells in that unit. Advanced players can explore additional logical patterns.

Practice Formula & Logic Checklist

Candidates(cell) = Digits 1–9 − Digits already used in the cell’s row − Digits already used in its column − Digits already used in its 3×3 box.

Use this candidate-elimination idea repeatedly. Sudoku is not an arithmetic test: the digits act as symbols in a logical placement puzzle. Online Sudoku interfaces commonly provide features such as checking moves, timing and notes; DigiSadhan adds a student-friendly mobile interface, scoring, progress, audio feedback, printable output and generated practice levels.

Why Practice Sudoku?

Sudoku is a convenient logic activity that can be played in short sessions. Difficulty can be adjusted from beginner-friendly puzzles to much harder puzzles, allowing learners to gradually increase the challenge. The online format also makes it easy to start a fresh puzzle, check work and track completion.

10,000+ Level System

DigiSadhan generates levels algorithmically from a large deterministic seed space. A level combines a valid completed Sudoku solution, controlled row/column/box transformations and a difficulty-specific clue-removal pattern. This makes it possible to offer a large practice library without shipping thousands of huge puzzle files.

Printable & PDF Practice

Use Save PDF to download the current puzzle as a PDF containing the puzzle, difficulty, level and solution. The separate Print button opens the browser print dialog for paper practice.

Sudoku for Students

Students can use Easy and Medium levels to learn systematic scanning and elimination. Hard and Expert levels can be used for advanced practice. Teachers and parents can also print puzzles for classroom or home activities.

Frequently Asked Questions

Can I shuffle the game? Yes. Shuffle creates a new puzzle at the selected difficulty. Can I select the timer? Yes, timer choices appear before every new game. Can I use it on mobile? Yes. The board and number pad are responsive. Can I see the solution immediately? No. Show Answer remains disabled until a Check action has been used. Can I download the puzzle? Yes, use Save PDF or Print.