This puzzle has 16 pieces which must be positioned to complete the trail. The trail is laser engraved, so positioning is quite precise. There is only 1 unique solution. It comes packed unsolved, but we do include the solution. The cover is laser engraved with the puzzle name and directions, so that years from now someone can pick it up and know what the challenge is. All hardwood construction with base and cover. The puzzle measures about 6" square. The design is copyrighted.