The rectangular puzzle, commonly referred to as the Gem Puzzle, Boss Puzzle, or the Game of Fifteen, is a classic brain teaser that challenges players to arrange numbered tiles in a specific order. This puzzle consists of square tiles, each displaying a number, placed inside a rectangular grid with one empty space. The objective is to slide the tiles around the grid, strategically moving them into their correct numerical sequence, from lowest to highest, using as few moves as possible. Variations of this puzzle include versions with images instead of numbers, adding a fun twist to the traditional format. Whether you're a beginner or a puzzle enthusiast, the game offers an engaging way to improve problem-solving and spatial reasoning skills.