Corner shape size and angle - see examples below. Techniques Piece Matching. Lining up the same shaped pieces with the same orientation allows you to focus more easily on a particular knob, hole or corner shape. When it comes down to trial and error, this also allows you to try the pieces in a logical order. When the last piece does not fit into the remaining hole.
Some puzzles pieces are very similar in shape, at least along two or three of the sides.
It is often possible to put a piece in the wrong place, especially when dealing with solid colour, and the find no other piece fits in. If you turn the pieces over and study them from the back, it is easier to see if they fit together or not. Puzzlers Tips Corner Look for a pattern. It will have a different color but the shape will be exactly the same. The pattern of pieces will be identical on each half or fourth of the puzzle.