A slide puzzle, also known as a sliding puzzle, is a puzzle that typically consists of a frame with numbered square tiles in random order. The goal is to slide the tiles to restore the order, usually from 1 to the highest number. Slide puzzles have been around for centuries, with the earliest known examples dating back to the 19th century.
Slide puzzles are popular because they are relatively simple to learn, but can be challenging to solve, especially for larger puzzles. They are also a good way to improve problem-solving skills and spatial reasoning. Solving a slide puzzle can also be a relaxing and enjoyable activity.