Rules: The Challenge is a sequence of 1000 standard Sudoku puzzles. In each puzzle, the goal is to insert the digits from 1 to 9 into the empty spaces so that each row, column, and square have exactly one of each digit. When you solve one puzzle, the challenge will advance you to the next. If you solve them all, great Sudoku bragging rights are yours.
Details: The Challenge uses cookies to remember you and your progress. Therefore, if you change computers, clear your cookies, or abandon the Challenge for an extended period (currently set to a year), the Challenge will forget you. Conversely, multiple people can work on the Challenge together if they use the same computer, browser, and, if applicable, user account.