I need to be more careful of what I joke about. In a previous post, I jokingly commented about finding a Sudoku Knight's Tour.

Guess what? They do exist! Over at the Border's Chess Club site, Dan Thomasson has created and posted a 25 by 25 Sudoku Knight's Tour. In each row, column and 5 by 5 square, the numbers 1-25 appear only once each. Also, a knight can tour any of the 5 by 5 squares and hit the squares in order (From square 1, he can move to square 2, then square 3, and so on up to 25).

Not impressed? He has also created a 36 by 36 Sudoku Knight's Tour with the same constraints for the numbers 1-36!