Sliding Puzzle

The Sliding Puzzle (also known as the 15-Puzzle) is a classic brain teaser with over 150 years of history — numbered tiles on an N×N grid can only be moved by sliding them into the empty space to restore the correct order. The rules are trivially simple, but finding the optimal solution is an NP-hard problem. From the puzzle craze started by Sam Loyd in the 1880s to its status as a classic search algorithm example in computer science courses, the sliding puzzle remains timelessly fascinating.

MeTool's Sliding Puzzle offers 3×3, 4×4, and 5×5 sizes with smooth sliding animations, crisp sound effects, and everything running locally in your browser. Open the page and start playing — zero registration, zero download. Whether it's a 3-minute break or a commute, sharpen your spatial reasoning anytime.

Three sizes, progressive challenge: 3×3 (8 tiles) for warm-up, 4×4 (15 tiles) for the classic experience, 5×5 (24 tiles) for a serious spatial reasoning test. Each size tracks your best time so you can keep improving.

Always solvable: MeTool shuffles by performing random valid moves from the solved state rather than random permutations, ensuring every puzzle is mathematically solvable.

Smooth animation + audio feedback: Canvas frame-by-frame rendering with 100ms ease-out curves, blue gradient tiles with rounded corners, paired with slide and victory sound effects — the feel is far superior to typical web implementations.

Multi-input support: Mouse click, touch tap, swipe gestures, and keyboard arrow keys — smooth controls on any device.

Pure frontend, zero privacy concerns: All logic runs locally in your browser. Best times are saved in localStorage. Just open and play.