Free Sudoku Online

How to play Sudoku

Sudoku is played on a 9×9 grid divided into nine 3×3 boxes. Some cells already contain numbers. Your goal is to fill every empty cell so that each row, each column and each 3×3 box contains the digits 1 to 9 exactly once.

Tap a cell to select it, then tap a number at the bottom of the screen. Every puzzle in Sudoku Bloom has exactly one solution, so you never need to guess – there is always a logical next step.

Four difficulty levels

• Easy – about 38 given numbers. Perfect for learning; solvable with the two basic techniques below.
• Medium – about 30 given numbers. Still no guessing required, but you will need to scan more carefully.
• Hard – about 26 given numbers. Notes become essential and you will meet more advanced patterns.
• Expert – about 23 given numbers. For experienced players who enjoy a long, deep solve.

Two techniques that solve most puzzles

• Single candidate: look at one empty cell and rule out every number that already appears in its row, column and box. If only one number is left, that is the answer.
• Single position: pick a number, for example 5, and look at one box. If there is only one cell in that box where a 5 can still go, place it there. The same works for rows and columns.
• Use Notes mode to pencil in the candidates for a cell. When you place a correct number, Sudoku Bloom removes it from the notes in the same row, column and box automatically.

Features

• A new daily challenge – the same puzzle for every player in the world on the same day.
• Notes, undo, erase and three free hints per puzzle.
• Your progress is saved automatically – close the tab and continue later.
• Grow your garden: every solved puzzle makes a new flower bloom.
• Works on phones, tablets and computers. On a keyboard use 1–9, the arrow keys, Backspace, N for notes and H for a hint.

Frequently asked questions