Daily Extreme Sudoku

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X 1 2 3 4
5 6 7 8 9
±1 ±2 ±3 ±4 ±5
±6 ±7 ±8 ±9  
Difficulty: Extreme Time 0:00

Complete the sudoku by filling in the grid with the digits 1 through 9 such that every row, column, and 3x3 box contains exactly one of each digit. You place digits in the sudoku grid by moving the mouse over a cell and typing the digit.

Sudoku is a logic based number placement game that was invented in the US, then popularized in Japan before spreading to the rest of the world. Many newspapers now include a daily sudoku puzzle (if you can't wait to check your answer, try our sudoku solver).

Read more about the history and mathematics behind sudoku in the Wikipedia sudoku article.