Sudoku
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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.