15 Puzzle — Free
The classic sliding tile puzzle. Slide the fifteen numbered tiles into order on a 4×4 grid, using the one empty space. Every board is guaranteed solvable.
Solved! 🎉
What is 15 Puzzle?
The 15 Puzzle is the original sliding tile game — a small 4×4 tray holding fifteen numbered tiles and a single empty square. Because one space is always open, you can slide any tile that sits directly beside it into that gap. Do this over and over and, tile by tile, you nudge the whole jumble back into order. The goal is simple to state and satisfying to reach: line the numbers up 1 through 15, reading left to right and top to bottom, with the empty square resting in the bottom-right corner.
The puzzle dates to the 1870s, when it swept across the United States and Europe as a genuine craze and even inspired a famous prize for solving an impossible arrangement — a challenge no one could win, because that particular board was unsolvable by design. That quirk is the heart of the puzzle's charm: exactly half of all random tile layouts can never be ordered, no matter how cleverly you slide. vygam checks every board's solvability before dealing it, so you always get a fair fight. Beyond the nostalgia, the 15 Puzzle is a compact workout for spatial reasoning and planning ahead, which is why it has stayed popular for a century and a half. It also travels under many names — the fifteen puzzle, the boss puzzle, the mystic square and simply the sliding puzzle — but the mechanics never change: one empty cell, fifteen tiles and a tidy numeric target. That elegant simplicity is exactly what makes it a favourite for quick mental breaks, classroom logic lessons and idle moments on a phone.
How to Play
The 15 Puzzle has no way to "lose" and no timer running out, but not every action is a legal slide. A move is rejected whenever:
- the tile you pick is not directly next to the empty square;
- the tile only touches the gap on a diagonal — tiles slide up, down, left or right only;
- you tap the empty square itself, which has nothing to move into it.
15 Puzzle Tips & Strategy
Random sliding will eventually make a mess. The trick is to solve the board in a fixed order, locking pieces in place so you never disturb the parts you have already finished. These four techniques take you from lucky to reliable.
Solve row by row, top down
Place tiles 1, 2, 3 and 4 in the top row first, then the second row, and so on. Once a top row is correct you should never need to move those tiles again — every later manoeuvre happens below them. Finishing from the top keeps the working area shrinking instead of unravelling your progress.
Do corners with the pair trick
The last tile in a row (like 4 or 8) is the awkward one. Park it just below where it belongs, bring the next-to-last tile into the corner, then rotate the pair into place together. This "load the corner, then spin" move is the single most useful skill in the whole puzzle.
Save the bottom two rows for last
The final two rows have to be solved as a unit, column by column, because there is no room left to shuffle freely. Work the left column of that block first (13 above the empty target), then the next, and the last four tiles fall into place almost on their own.
Think one slide ahead
Before you move, picture where the blank will end up, because the empty square is really the piece you are steering. Chasing fewer, purposeful slides — rather than reacting tile by tile — is how you shrink your move counter and beat your best score.
FAQ
Is the 15 Puzzle free to play?
Yes — the 15 Puzzle on vygam is completely free. There is no download and no sign-up; it loads and plays instantly in your browser on phone, tablet or desktop.
How do you solve the 15 Puzzle?
Slide tiles one at a time into the single empty space until the numbers read 1 to 15 in order with the blank in the bottom-right corner. Most players solve the top rows first, then the left columns, and finish the last two rows together.
Is every 15 Puzzle solvable?
On vygam, yes. Only half of all random tile arrangements can be solved, so the game checks the inversion parity of each board before dealing it and reshuffles any layout that is impossible. You will never be handed an unsolvable puzzle.
What is the fewest moves to solve the 15 Puzzle?
It depends on the starting layout. The hardest possible 15 Puzzle positions need 80 single-tile slides, while an easy scramble may take only a handful. Your move counter and best score help you chase a more efficient solution each time.
Can I play the 15 Puzzle with a keyboard?
Yes. Use the arrow keys to slide the tile next to the blank in the chosen direction, or simply tap and click tiles on a touchscreen or with a mouse. Both input methods work the same way.