The Sudoku - Classic Sudoku Puzzle game by Guru Puzzle Game is free to download on both major mobile platforms. This makes it accessible to anyone looking to enjoy the timeless challenge of Sudoku without any initial cost. You can dive into the world of number puzzles right away without worrying about upfront charges.

While the game is free, it does offer in-app purchases. These purchases typically include hints or other features that might help you complete puzzles faster. Additionally, advertisements are present throughout the gameplay but generally do not disrupt the experience. The ads may appear between puzzles or at the bottom of the screen, with the option to remove them via a purchase if desired. You have the flexibility to enhance your gaming experience further if you choose.

Installation on iOS Devices: To install Sudoku - Classic Sudoku Puzzle on an iOS device, ensure that your device runs iOS 10.0 or later. Open the App Store from your home screen and tap on the search tab at the bottom. Type "Sudoku - Classic Sudoku Puzzle" in the search bar and select the game from the results. Tap the "Get" button and authenticate the download with your Apple ID password, Face ID, or Touch ID. Once the download is complete, the app will automatically install. When opening the game for the first time, you may be asked to allow notifications, which can enhance your gaming experience by alerting you of daily challenges or updates.

Installation on Android Devices: For Android devices, ensure your OS is version 5.0 or higher. Open the Google Play Store, tap the search icon, and enter "Sudoku - Classic Sudoku Puzzle" in the search field. Select the correct app from the provided list and tap "Install." Confirm any on-screen prompts if necessary. The app will download and install automatically. Upon opening the game for the first time, pay attention to requests for permissions such as access to storage or notifications. Granting these can enable features like saving game progress or receiving updates on new puzzles.

Step 1: Launch the game by tapping on its icon. Upon entering, you may be greeted with a tutorial or a menu offering different puzzle difficulties, ranging from easy to expert. Take a moment to understand the settings if they appear, as they might explain scoring or other gameplay mechanics.

Step 2: Choose your desired difficulty level from the menu. Beginners may want to start with 'Easy' to familiarize themselves with the Sudoku rules and grid layout. Tap on the level you wish to play.

Step 3: As the game begins, you will see a 9x9 Sudoku grid. Some numbers will already be filled in. Your goal is to fill in the empty cells so that each row, column, and 3x3 box contains the numbers 1 to 9 without repeating.

Step 4: Tap on an empty cell to select it, then enter a number using the number pad typically displayed at the bottom of the screen. Use logic and process of elimination to determine the correct number for each cell. If you're unsure, utilize the 'hint' option, if available, to assist you.

Step 5: Continue filling in numbers until the entire grid is complete. The game may provide feedback to indicate correct placements or completion. Take your time and enjoy the logical challenge, or track your progress and aim for a faster completion time!

Tip 1: Begin by scanning for any rows, columns, or 3x3 boxes that already have many numbers filled in. These areas will be the easiest to solve, giving you a stronger foundation to work from as you progress through the puzzle.

Tip 2: Use the 'pencil' or 'note-taking' feature if the app includes one. This feature allows you to jot down potential number candidates in a cell before making a final decision. It's a helpful way to keep track of possibilities and eliminate options as the game progresses.

Tip 3: Keep an eye on patterns such as the "naked pairs" or "hidden singles." Recognizing these classic strategies can greatly increase your ability to solve complex puzzles. Additionally, learning such techniques will improve your game skills over time, making even the 'Expert' level attainable.