The 15 Puzzle is a sliding puzzle consisting of a frame divided into a grid of 16 squares, with 15 numbered tiles and one empty space. The objective is to arrange the tiles in numerical order, from 1 to 15, by sliding them into the empty space. Players can only move tiles adjacent to the empty space, making strategic moves necessary to solve the puzzle. The 15 Puzzle is a classic example of a combinatorial puzzle and has been popular since its invention in the 19th century, challenging players' problem-solving skills and spatial reasoning.