The 15 Puzzle is a classic sliding puzzle game that consists of a 4x4 grid of numbered tiles, with one tile missing. The goal of the game is to arrange the tiles in numerical order by sliding them around the grid, using the empty space as a "buffer" to move tiles.

To start the game, the tiles are randomly shuffled within the grid, creating a unique puzzle each time. The player then must use logical reasoning and spatial awareness to solve the puzzle by sliding tiles into the empty space to create a sequence of 1 to 15, with the blank space in the bottom right corner.

The game is played by clicking or tapping on a tile that is adjacent to the empty space, causing the tile to move into the empty space. This creates a new empty space in the tile's previous position, allowing the player to slide other tiles into new positions. The goal is to use as few moves as possible to rearrange the tiles in the correct order.