Sudoku: Train Brain Puzzles, a classic Sudoku puzzle game with beautiful themes. Play Sudoku offline and customize the theme at will!

Themes Your Way in Sudoku: Customize your Sudoku themes, including Cherry Blossoms, Farm, Islands, Windmills, and Fish. We will update more Sudoku themes in the future. For purists, we also offer minimalist Sudoku themes for those who want to enjoy pure Sudoku joy.

Discover the Joy of Sudoku: Sudoku is a classic number puzzle that features a 9x9 grid. The aim of the classic Sudoku puzzle is to fill all cells so that each row, column, and 3x3 block contains the numbers 1 to 9. Sudoku provides a relaxing way to train your brain while passing the time. Playing Sudoku games with a pencil in the newspaper remains a fond memory for many. Now, you can enjoy playing Sudoku puzzles anytime, anywhere.

Features at a Glance:
• Over 20000 Sudoku Puzzles: Our Sudoku offers 5 difficulty levels from easy to master, suitable for both beginners and experienced players. There are also some interesting Sudoku variations with grids of 6x6, 12x12 and 16x16.
• Sudoku Challenge Events: Daily Sudoku challenges, jigsaw events, journey events are added regularly. Participate and earn trophies, medals, and beautiful jigsaws pictures to enhance your Sudoku collection!
• Smart Hints: When using hints in a Sudoku game, it shows the next step of the solution to help you understand the logic behind each step. By using smart hints, you can learn good Sudoku skills, which is suitable for beginners.

Advanced Features:
• Highlight Options: Highlight the cells you are observing to assist you in thinking.
• Number-First Input: Cell-first or number-first, choose your preferred input method.
• Auto Remove: Automatically delete outdated notes to simplify your notes.
• Prevent Wrong Notes: Alert and prevent you from taking conflicting notes.
• Show Remaining Counts: Easily track the remaining counts for each number.
• Hide Used Numbers: Focus on the numbers you need by hiding completed ones.
• Fast Pencil: Fill all cells with the correct notes instantly.

Sudoku welcomes you, step into the wonderful Sudoku world today and discover your favorite way to enjoy it!

// Option A //

To download Sudoku: themes & challenges mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Sudoku: themes & challenges mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Sudoku: themes & challenges from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Sudoku: themes & challenges in HappyMod App.