SUDOKU / 001
Classic Sudoku
Difficulty
Preparing your puzzle…
Your practice
0Puzzles solved
0Consecutive daily puzzles
Arrow keys to move · 1–9 to fill · N for notes
SUDOKU NOTES
Don’t just place a number. Know why it belongs.
01Beginner
Sudoku for beginners: one rule is enough
No arithmetic and no guessing. Once you understand rows, columns and boxes, you are ready.
2 min02BeginnerSudoku pencil marks: how to write and update candidates
Learn what the small numbers mean, how to find every legal candidate, and when a note can safely be removed.
3 min03PracticeStuck on Sudoku? A step-by-step checklist before guessing
Check mistakes, repair notes and scan the simplest patterns in a useful order. Know when a hint is helping and when it is only revealing an answer.
3 min