His Sudoku used a 9x9 square, and all rows and columns needed to contain the numbers 1-9. These number puzzles disappeared around World War I, but reemerged in 1979 when an Indiana man named Howard Garns published the first modern Sudoku puzzle. The rows and columns did, though, add up to the same number. The number puzzles were not the exact same as sudoku, though, because they contained some double-digit numbers and did not have sub-squares. Number puzzles became popular in the late 1800s in France, when newspapers began to publish partially-filled number grids on their pages. Additionally, the puzzle is updated daily, giving you a new Sudoku challenge each and every day! Sudoku History We offer Sudoku for beginners, medium sudoku, and Sudoku for experts. Our free online version of web Sudoku follows in the number puzzle's classic tradition, no pen or pencil needed! As you start the puzzle you can choose your sudoku difficulty.