I am a Magician and I recently was asked to do a show for a friend who was having a birthday party. The way the trick worked was the birthday lady, selected from a large box of random puzzle pieces a single piece. Little did she know that we had previously assembled this (The puzzle shown) as puzzle missing just one of the pieces. It was behind us on an easel covered with a cloth the entire time. In front of 80 friends and family members the birthday girl placed in the final missing piece to the puzzle. It brought the house down! I will definitely use this trick and Piczzle again Thanks. The Great Roudini