Sudoku for Android

About Sudoku

Sudoku is the classic number logic puzzle. You fill a 9x9 grid so that every row, every column and every 3x3 box contains the digits 1 to 9 exactly once. Some digits are given at the start, and the rest is up to your reasoning.

In GameHub, every new game builds a brand new puzzle with exactly one solution, so you never need to guess. Pick Easy, Medium, Hard or Expert, use pencil notes, undo and a few hints, and your unfinished game is saved so you can come back to it later.

How to play

1. Choose a difficulty: Easy, Medium, Hard or Expert. Harder levels start with fewer given digits.

2. Tap an empty cell. The cell's row, column and box light up to help you see what is already used.

3. Tap a number on the pad to place it. A wrong digit counts as a mistake, and three mistakes end the game.

4. Switch on Notes to pencil small candidate digits in a cell without committing to an answer. Placing a digit clears matching notes in its row, column and box.

5. Use Undo to take back a move, Erase to clear a cell, or Hint to reveal a correct digit (3 hints per game).

6. Fill every cell correctly to solve the puzzle and earn up to three stars.

Pro tips

• Start with the digits that appear most often on the grid, and look for the row, column or box where one cell can only take one number.
• Use Notes early on tough puzzles. Once a cell has a single candidate left, you can place it with confidence.
• Scan one box at a time, then one row or column at a time, instead of jumping around the grid.
• Save hints for when you are truly stuck. Each mistake and each hint lowers your star rating.
• Since every puzzle has exactly one solution, there is always a logical next step. Never guess.