This 3D puzzle doubles as a pocket-sized game called "Fifteen," featuring the famous sliding puzzle. The goal is to rearrange numbered tiles by sliding them into an empty space, aiming to arrange the numbers from 1 to 15 in sequential order. Players can challenge each other, striving to complete the game using the fewest possible moves. Conveniently, the game tiles are stored in a designated space within the box, making it an excellent travel set. This game is part of our collection of compact travel games and puzzles. Multi-pack of 5 identical games, perfect from classes and group activities.Details:Fifteen sliding puzzle design2.9" x 2.8" x 3" assembled sizeSold as 5 packsEach pack includes 21 piecesEco-friendly 3D STEM models to assemble and customize at school or homeWooden Puzzle with very high precision plywood piecesNo messy glue requiredVery sturdy constructionAll-inclusive boxes, self-assemblyClear colorful step-by-step assembly instructionsFor ages 14 and up