Sudoku Zero - Number puzzles 4+

Sudoku Zero is a popular classic puzzle game with numbers that trains the brain. Have a great time solving the daily brain-burning classic number puzzles! Thousands of number puzzle levels are ready to be conquered. Join this free brain-burning Sudoku Zero and experience the classic number logic puzzle!
Classic Sudoku for beginners and advanced players: Whether you are an avid fan of classic Sudoku puzzles or just looking for a game with numbers or math puzzles to relax while training your brain, develop logical thinking and improve memory. Sudoku Zero is the perfect choice for you.
Although Sudoku Zero is more challenging than Classic Sudoku, we have tried our best to make it playable for players of all skill levels. It features four levels of difficulty: easy, medium, hard and expert. Therefore, whether you are new to Sudoku or an advanced Sudoku player, this Sudoku puzzle will keep you entertained. We are sure you will be a Sudoku master in no time!
Sudoku Zero has many names: Sum Sudoku, Additive Sudoku, Kakuro, and so on, but the rules are equally simple in all games. Like the classic Sudoku, your goal is to fill in the nine squares with numbers and make sure that the sum of the numbers in the cage (the area separated by dotted lines) is equal to the number in the upper left corner of the cage. Still feel complicated? Let's review the detailed rules below.

-- As in Classic Sudoku, fill in the numbers 1-9 in all rows, columns and 3x3 box
-- Note the cage: groups of cells shown as dotted lines.
-- Make sure that the sum of the numbers in each cage is equal to the number in the upper left corner of that cage.
-- The special rule for this number logic puzzle is that the sum of all the numbers in each 3x3 box, in each row or column, is equal to 45.
-- The numbers in the cage, each row, each column, or each 3x3 box cannot be repeated.

Features of Sudoku Zeros:
-- Participate in events In the battle, compete to be the first Sudoku Zero and win more rewards!
-- Free daily Sudoku Challenges. Complete the free daily Sudoku challenges to earn unique trophies.
-- Seasonal Sudoku Adventures. Participate in Seasonal Sudoku Adventures and stand a chance to win unique trophies and solve Sudoku puzzles.
-- Auto-Check. Challenge yourself in finding out the mistakes to challenge your number logic thinking or enable automatic checking to check your mistakes at any time.
-- Notes. Open notes and add notes when you are not sure which number to fill in.
-- Hints. When you get stuck on a difficult puzzle, use the hints and the system will automatically fill in the correct number in the cell you choose to guide you through the difficulty.

More Features
Statistics: Track your progress for each difficulty level of the Sudoku puzzle, analyze your best time and other achievements
Unlimited Undo: Made a mistake? Don't worry, you can undo it with a click
Themes: Choose one of the personalized skins to design your own Sudoku kingdom!
Auto-save: If you exit an unfinished Sudoku game, we'll save your progress so you can continue at any time.
Highlight: Highlight the rows, columns and boxes associated with the selected cells.
Eraser: Get rid of the mistakes in the free sudoku games
Play whenever you want: Bring your favourite number logic game with you anywhere! Sudoku Zero is an online Sudoku puzzle game, which can still be played offline. Playing this free online Sudoku Zero game on mobile devices is as interesting as playing Sudoku with pen and paper.
If you love number logic games and solving sudoku puzzles, welcome to our Sudoku Kingdom - Sudoku Zero: Classic Sudoku, Number Logic Puzzle Game! Enjoy playing this free classic number logic puzzle game in your free time to keep your mind agile and challenge your brain and develop logical thinking. Regular practice will increase your ability to solve even the most complex number puzzles in no time and become a real Sudoku master.