How to Fix a Broken Pizza Puzzle
First, find the broken piece. Place it in a well-lit area. It should be as straight as possible. Place a piece wax paper on top of the area you wish to repair. After the piece has been placed on the wax paper you can apply a little glue to a toothpick. Carefully reattach the piece. If the piece is very damaged, you may want to use a tweezers to help you with the process.
Next, clean the piece. It is important to match the original color as closely as possible. Once you are done, place the piece into a ziplock bag with a post-it note. This will help protect the piece from dust and dirt as it dries. After the repair is complete, you can donate or gift it to someone.