Sudoku Puzzle
Sudoku
Pure Deduction
Fill in numbers 1-9 without overlap!
How to play
Fill the 9×9 grid so every row, column and 3×3 box contains the digits 1-9 exactly once.
Eliminate before you place
Before placing a digit, eliminate those already present in the same row, column, and box. Cells with one candidate and units with one possible position for a digit are the safest starting points.
One duplicate breaks the whole solution. When stuck, do not add guesses; revisit how the latest confirmed digit changed candidates in its row, column, and box.
Origin & history
Sudoku began as 'Number Place' in 1979 America and became a global phenomenon after Japan's Nikoli named it 'Sudoku' in 1984.
FAQ
What are the basic no-guess techniques?
Start with hidden singles (only one cell in a unit can take a digit) and naked singles (a cell with one candidate). Every proper puzzle is solvable by logic alone.