Hints for anyone who needs/wants them: There are 2 long diagonal lines going from the top left to bottom right and the top right to bottom left corners - the lines are 1x1 squares going all the way down Also if you look at it as 25 5x5 boxes then going from left to right, top to bottom, the 8th set of 5x5 and the 18th set of 5x5 have X's made of 1x1 squares in them as well. Hope this helps :)