These are some jigsaw horseshoe crab puzzles. They are all the same picture, but one is easy (15 pieces), one medium (28 pieces), and one hard (45 pieces). Try them.

    These are some sliding puzzles of horseshoe crabs. They both use the same picture, but one is easy (3x3 squares) and one is harder (4x4 squares). Shuffle the pieces and see how many moves it takes for you to get the original picture.

Mr Steve White, who lives in Norway, helped us with these puzzles.