Puzzle Duel

Each players gets a puzzle-frame, 8 big pieces and 8 small pieces (one or two squares).
You put five big pieces into the frame. The empty spaces you fill up with the small pieces. Then you remove the big pieces. After that the players give each other their puzzle-frame and the five pieces. The first player that can put the five pieces back into the frame, wins the game.
To make it more difficult, you can give each other 8 pieces. In that case, you don't know which five to use.