Work through 100 classic Sudoku puzzles, ranging in difficulty from Easy to Master. Draw freely on the board to visualize your reasoning as you solve. No ads or in-app purchases.

Key Features:

Color cells and possible numbers, and draw lines between them to keep track of your reasoning right on the board
Find a challenge that suits you with difficulty ratings based on solving techniques. Built-in puzzles, puzzles you enter, and randomly generated puzzles all use the same standard
Have the game generate more puzzles at your chosen difficulty, with six levels from Easy to Grandmaster
Progress saves automatically, so you can take a break and pick up where you left off
Play entirely offline — no internet connection required
Use small numbers to mark what could go in each cell, or choose to have the game list them at the start or remove ruled-out possibilities as you fill in numbers
Highlight matching numbers across the board to make them easier to find and compare
Turn on optional warnings to spot repeated numbers in the same row, column, or 3×3 box
Undo a mistaken action, or restore an action you just undid
If you're unsure about a number you've entered, check whether it's correct, up to five times per puzzle
Play with mouse or keyboard, whichever feels more comfortable
Bring Sudoku puzzles you've found into the game by entering them by hand or pasting their text
Keep puzzles in your own groups, give them names and descriptions, and arrange them however you like
Write down your thoughts on each puzzle, and see your fastest time and how many times you've solved it
Copy a puzzle, or your current numbers and pencil marks, as text to send to others for discussion

Solving a Sudoku Puzzle

Drawing on the Board

Solve your first built-in puzzle.

Solve 20 of the 100 built-in puzzles.

Solve 40 of the 100 built-in puzzles.

Solve 60 of the 100 built-in puzzles.

Solve at least one built-in puzzle on each difficulty: Easy, Normal, Hard, Expert and Master.

Solve 5 different built-in puzzles on Expert or higher.

Solve a puzzle on Hard or higher without using a single check.

Solve a puzzle on Hard or higher without ever entering a number that duplicates another number in the same row, column or box.

Solve any puzzle in under 15 minutes.

Solve a puzzle on Hard or higher in under 30 minutes.

Use the chain tool to draw a chain on the board.

Solve a puzzle on Hard or higher with “Fill candidates at start” disabled when the attempt begins, marking at least one candidate by hand and never using “Fill in or clean up candidates” during that attempt.

Enter a puzzle manually or import one as text, then save it to one of your own collections.

Generate a random puzzle and save it to one of your own collections.

Solve a puzzle from one of your own collections.

Solve a puzzle again and beat your previous best time for that puzzle.