Classic sliding puzzle game
Click a tile adjacent to the empty space to slide it. Arrange all tiles from 1 to 15 in order, with the empty space at the bottom-right corner, to win. Start with 3x3 (8-puzzle) to get the hang of it.
Exactly half of all possible configurations are solvable - this is mathematically proven. This game only generates solvable puzzles by shuffling from a solved state using valid moves.
Use the 'row-first strategy': complete the top two rows first, then work on the rest below. The last two tiles of each row must be placed simultaneously. The final two rows should be solved column by column.
The 15 Puzzle was invented by Noyes Palmer Chapman in 1874. It became a worldwide craze in the 1880s, known as the '15 Puzzle Craze.' Mathematician Sam Loyd famously presented an unsolvable configuration, sparking widespread interest. It remains one of the oldest and most famous sliding puzzles.
The 15 Puzzle effectively improves spatial reasoning, sequential planning, and working memory. Since you need to plan several moves ahead, it develops strategic thinking similar to chess, and is also great for children's mathematical development.
The 15 Puzzle (Fifteen Puzzle) is the world's most famous sliding puzzle game, invented in 1874. The goal is to arrange tiles 1-15 in order on a 4x4 grid using the empty space. Supports 8-puzzle (3x3), 15-puzzle (4x4), and 24-puzzle (5x5) with move counter and timer. Develops spatial reasoning, problem-solving, and planning skills. A classic puzzle beloved for over 140 years since the '15 Puzzle Craze' of the 1880s. Play free online in your browser with no installation required.