15-Puzzle

The puzzle starts with numbers 1-15 randomly arranged in a 4x4 grid with one empty space

Click on any tile adjacent to the empty space to slide it into the empty position

Continue sliding tiles to arrange them in numerical order from 1-15

The goal is to get all numbers in order with the empty space in the bottom-right corner

Try to solve the puzzle in as few moves as possible to beat your best score

Click 'Shuffle' to start a new puzzle with a different arrangement

Challenge your viewers to solve it faster than you can

Let chat vote on which tile to move next for collaborative solving

Create speed-solving competitions with your community

Set move count goals and celebrate when you achieve them

Use the puzzle as a 'thinking break' between other games

Host tournaments where viewers compete for the lowest move count

Only tiles adjacent to the empty space can be moved

Tiles slide into the empty space when clicked

The puzzle is solved when numbers 1-15 are in order with the empty space last

Every generated puzzle is guaranteed to be solvable

Your best score (fewest moves) is automatically saved

There's no time limit - focus on efficiency over speed

Start by getting the top row (1, 2, 3, 4) in the correct position

Work on one row or column at a time rather than random moves

The last two tiles in each row/column often require special techniques

Don't be afraid to temporarily move solved pieces to access others

Practice the 'cycling' technique for moving tiles around obstacles

The theoretical minimum for most puzzles is around 50-80 moves