Sudoku online | Blupoli

Logical reasoningDeduce consequences and eliminate incompatible options.
Attention to detailTrack clues and detect conflicts on the board.
Working memoryHold several clues and constraints in mind while deciding.
Pattern recognitionIdentify regularities, symmetries and meaningful combinations.

Complete the 9×9 grid without repeating numbers in rows, columns or blocks.

These puzzles engage different skills while you play. This does not in itself establish general cognitive improvement or replace professional care.

Complete the 9×9 grid without repeating numbers in rows, columns or blocks.

Fill every row with the numbers 1 to 9 without repetition.
Do the same in every column: all nine numbers must appear exactly once.
Each 3×3 block must also contain 1 to 9 with no duplicates.
Select a cell and use the keypad below the board. Enable Notes when you want to record small candidates.

Before guessing, scan row, column and block for unique candidates; record possibilities without committing to an answer.
Blue numbers are your entries; fixed clues remain white.
All solving controls are below the board: numbers, undo, redo, erase, notes, auto-notes and hint.
Enable Notes or press N to record small candidates without committing to a final answer.
Thick lines separate the nine 3×3 blocks, while the selection also highlights its row, column and block.
If you repeat a number, conflicting cells are marked red before you check the puzzle.

Modern Sudoku combines numerical-grid ideas with a long history of distribution through Japanese puzzle magazines and international newspapers.

Blue numbers are your entries; fixed clues remain white.
All solving controls are below the board: numbers, undo, redo, erase, notes, auto-notes and hint.
Enable Notes or press N to record small candidates without committing to a final answer.
Thick lines separate the nine 3×3 blocks, while the selection also highlights its row, column and block.
If you repeat a number, conflicting cells are marked red before you check the puzzle.

Where should I begin? Before guessing, scan row, column and block for unique candidates; record possibilities without committing to an answer.
What makes this game different? Select a cell and use the keypad below the board. Enable Notes when you want to record small candidates.

Sudoku