A 3×3 slide puzzle, also known as a 15-puzzle, is a sliding puzzle that consists of a 33 grid of square tiles numbered 1 through 15, with one tile missing. The objective of the puzzle is to slide the tiles to restore the correct order of the numbers.
3×3 slide puzzles are popular puzzles that have been enjoyed by people of all ages for many years. They are relatively easy to learn, but can be quite challenging to solve, especially for beginners. However, with a little practice, anyone can learn to solve a 3×3 slide puzzle.