Today's SUDOKU FAQ
Quick answers about gameplay, puzzle generation, saved progress, challenge tracking, archive pages, and the overall product structure.
Frequently asked questions
These answers cover the most common player questions about puzzles, controls, saves, and daily play.
Can I continue a Sudoku game later?
Yes. Today's SUDOKU saves your current board, timer, notes, settings, and progress in local storage. If you refresh the page or come back later on the same device, the puzzle can continue where you left off.
Are there daily Sudoku puzzles?
Yes. Every day has a deterministic daily Sudoku in easy, medium, hard, and expert. That means each daily route is stable, shareable, and replayable from the archive.
Does Today's SUDOKU work well on mobile?
It does. The board, number pad, controls, and spacing are designed to stay fast and touch-friendly on smaller screens without sacrificing keyboard-friendly desktop play.
How are puzzle difficulties chosen?
Difficulty comes from the puzzle generator targets, clue count, and the resulting solving pressure on the board. Easy boards are more generous, while hard and expert boards leave fewer givens and ask for better candidate management. Every generated puzzle is also checked for a unique solution.
Do I need to create an account?
No. Today's SUDOKU is intentionally account-free. Progress, streaks, monthly challenge data, Hall of Fame entries, and personal stats are stored locally in your browser so you can start instantly.
What does notes mode do?
Notes mode turns number input into pencil marks instead of final answers. It lets you mark possible candidates in a cell, which becomes especially useful on medium, hard, and expert puzzles where elimination matters more than speed.
What is the difference between Hint, Check, and Reveal mistakes?
Hint places one correct value for you. Check scans the full board and jumps to the first detected issue if something is wrong. Reveal mistakes is a visual cleanup tool that highlights wrong entries currently on the board without changing any values for you.
Can I use keyboard shortcuts?
Yes. Use arrow keys to move between cells, number keys to place values, backspace or delete to clear a cell, and the notes toggle when you want to switch into pencil marks mode.
How does the monthly challenge work?
The monthly challenge tracks how many Sudokus you complete during the current month. The target is 30 finished boards, and any completed puzzle counts toward it, including random boards and daily puzzles.
What happens after I finish a board?
After completion, you can share your result, save a retro-style alias to the local Hall of Fame, review your challenge progress, and start another puzzle right away.
Contact
If you want to send feedback, report a problem, or say hello, write to hello@todayssudoku.com.
Need a deeper answer than the FAQ?
Use these guided pages when you want a fuller explanation of Sudoku rules, solving methods, and improvement habits.
How to play Sudoku
Start with the fundamentals of the grid, the core rule set, and a beginner-friendly solving rhythm.
Sudoku rules
Learn the formal rules clearly so you can separate valid logic from accidental mistakes.
Sudoku strategies
Build stronger habits for scanning, eliminating, and progressing through tougher boards.
Sudoku tips for beginners
Use a cleaner process to improve faster and avoid the most common early habits that slow players down.
How to solve hard Sudoku
Focus on note discipline, pressure points, and patient rescanning when easy logic runs out.
What pencil marking means
Understand notes mode, why it matters, and how to keep pencil marks useful instead of cluttered.
Sudoku history
See where Sudoku came from, how it evolved from older number puzzles, and why the modern version became a global habit.