A Hard Puzzle

Many of you have heard of the 8 queens puzzle, where you put 8 queens on the board with no to on the same row,colum, or diagnal.  If you have solved this than you may want to try this mor challanging puzzle. It is called the knight puzzle. basically you put just your knight on the board and move him so that he touches every square once and ends on the square he started on. I recommend covering the squares you have already touched so you don't forget. It is a tough one so leave me a comment if you solve it.