Fifteen

Fifteen also known as the 15-puzzle or sliding puzzle, is a classic logic game that challenges players to arrange numbered tiles in ascending order within a 4×4 grid. The puzzle consists of 15 square tiles numbered 1 through 15, with one empty space that allows adjacent tiles to slide into place.

The objective is simple yet deceptively difficult: reorder the scrambled tiles into the sequence 1 to 15, left to right and top to bottom, with the empty space in the bottom-right corner.

Originally invented in the late 19th century, the Fifteen puzzle gained immense popularity and has since become a staple of recreational mathematics and algorithmic problem-solving.

This "Fifteen" puzzle offer randomized starting configurations, intuitive controls, and often include features like move counters or solvability checks. You also can custom the grids of the puzzle. Despite its minimalistic design, the game demands strategic planning, spatial reasoning, and patience, making it both accessible to beginners and deeply engaging for seasoned puzzle enthusiasts.

Slide the tiles around the box until they appear in numerical order from the top left, with the hole in the bottom right corner.

Click on a tile to slide it towards the hole.

You can also use the arrow keys on your keyboard to move the tiles.

The challenge lies in the limited space and the need to think several moves ahead. Players must carefully plan their moves to avoid getting stuck and to create a path for the tiles to reach their correct positions.