Sudoku

Sudoku (数独 sūdoku, digit-single) (/suːˈdoʊkuː/, /-ˈdɒk-/, /sə-/, originally called Number Place) is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.

Sudoku for beginners and advanced players. Whether you'd like to relax or keep mind active – pass your free time in a pleasant way!

***History

Number puzzles appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from magic squares. Le Siècle, a Paris daily, published a partially completed 9x9 magic square with 3x3 subsquares on November 19, 1892. It was not a Sudoku because it contained double-digit numbers and required arithmetic rather than logic to solve, but it shared key characteristics: each row, column and subsquare added up to the same number.

The modern Sudoku was most likely designed anonymously by Howard Garns, a 74-year-old retired architect and freelance puzzle constructor from Connersville, Indiana, and first published in 1979 by Dell Magazines as Number Place (the earliest known examples of modern Sudoku)

***Features

✓ Challenge yourself figuring out your mistakes, or use a HINT to see your mistakes as you go

✓ The pencil mode will help you alot. It is to make notes as on paper. Each time you fill in a cell, notes are automatically updated!

✓ Highlight duplicates to avoid repeating numbers in a row, column and block

Highlights

• Unlimit puzzles

• 9x9 grid

• 4 perfectly balanced levels of difficulty: easy, medium, hard, and expert

• Support both phones and tablets

Train your brain anywhere, anytime!