43% complete
35/81 correct · 35 filled
Play controls
Difficulty switcher, timer, notes toggle, optional validation, and explanation-first help.
Instant validation
Mark wrong placements as you enter them.
Reveal mistakes
Toggle visible mistake highlights when you want a cleanup pass.
Hints
0
Win rate
0%
Streak
0
Pick a cell to start.
Play Sudoku online with a board-first layout and Explain Move
Start a puzzle immediately, switch difficulties, save your place locally, and use Explain Move when you want the next decision explained without simply being given the answer.
Complete 30 Sudokus in April 2026
Completed
0
Goal
30
Streak
0
Every finished board counts. Daily runs, random boards, and difficulty switches all move the counter forward.
Month challenge: finish 30 Sudokus before the month ends
This challenge is stored locally on your device, so you can keep the arcade-style rhythm without creating an account. Finish any mix of easy, medium, hard, expert, or daily boards to clear the month.
Every completed board counts toward the monthly total, including replayed difficulties and daily puzzles.
Use the Hall of Fame after each finish to save a retro alias and build a local cabinet of great runs.
Explain Move
See the logic behind the next strong move before you place anything.
Learn nearby
Jump from the board into technique pages and beginner guides without losing context.
Daily loop
Use the play route as a base, then keep the habit alive through the daily puzzle and archive.
Progress visible
Streaks, best runs, and local leaderboard feedback now sit closer to the main game flow.
Streaks, achievements, and saved runs
0
No run yet
0
0
Achievement preview
7-day streak
LockedSolve the daily board 7 days in a row.
Solved without hints
LockedFinish one board without using hints.
Under 5 minutes
LockedFinish a board in under five minutes.
Expert finisher
LockedSave one completed expert run to the leaderboard.
Leaderboard preview
Finish a board and save an alias to add your first local result.
How to use the board efficiently from the first move
This route is built for instant play, but it should also teach a clean solving rhythm. Use this quick tutorial to turn the game controls into a better process.
Step 1
Pick one zone and commit to it
Instead of scanning the whole grid at once, choose a single row, column, or box. Focused scanning reduces noise and helps strong candidates stand out.
Step 2
Use the board highlights to keep context
When you select a cell, Today's SUDOKU highlights related units and matching values. Use those cues to see the puzzle structure faster and avoid accidental duplicate placements.
Step 3
Switch between final answers and notes deliberately
Treat notes mode like a different solving layer. Final answers belong to cells you trust; notes belong to cells you are still narrowing down.
Step 4
Check progress when you want a cleanup pass
Reveal mistakes and Check both help you stabilize the board. They are especially useful after a long sequence of note-heavy solving.
Learn the logic behind the game
The board should never feel disconnected from learning. These pages explain the rules, strategy habits, hint philosophy, and note-taking concepts that make the game stronger over time.
How to solve Sudoku
A system-first guide that matches the new explanation-first play flow.
Sudoku hints
Understand why Explain Move is stronger than a direct answer in the main play route.
Hidden Singles
Learn how hidden singles work, when to scan for them, and how to practice them on a live Sudoku board.
Naked Pairs
Understand naked pairs in Sudoku, when they matter, and how they help clear clutter from rows, columns, and boxes.
How to play Sudoku
Start with the fundamentals of the grid, the core rule set, and a beginner-friendly solving rhythm, then practice on the play board.
Sudoku rules
Learn the formal rules clearly so you can separate valid logic from accidental mistakes before tackling daily puzzles.