The following figure shows a puzzle that has been partially completed and the set of accompaining pieces that must fit in (you can rotate the pieces and also flip them over).

One of the pieces is however from another puzzle and won't fit in the solution. Can you discover what is the shape of the remaining piece ?

Note:

This is the very same problem presented previously but this time the same solution can't be applied. Is there a better way than actually solve the puzzle to find out which one of the pieces is from another puzzle ?

Click the right arrow to see the solution or the left arrow to go back to the problem list.