LESS SCROLLING. MORE SOLVING.

Logic puzzles.
A little more
perspective.

Make room for a different kind of screen time.
Thoughtful logic puzzles. Small challenges.
That lovely feeling when it finally clicks.

Explore the 15 Puzzle
No downloads No sign-up Just one more try
Your next “aha!” starts right here.
Fifteen tiles. One satisfying finish.

Order tiles 1 to 15. Leave the bottom-right space empty.

Tap a highlighted tile to begin.

MOVES0
TIME00:00
BEST · SOLO—
Solo attempt

Hints use separate Assisted scores.

Tap a tile next to the gap, or use ← ↑ ↓ →

Best scores
Solo
—
Assisted
—

For this difficulty, on this browser. Fewest moves, then time.

GOOD THINGS TAKE A LITTLE THOUGHT

Find the pattern.

Make your move.

Enjoy the click.

THE COLLECTION

A few ways to find your flow.

Start small. Think differently.
Take your time.

Today’s small puzzle · 8 Puzzle

A LITTLE GUIDANCE

Guides & Comparisons

Find your next puzzle. Learn a new way to solve it.

YOUR FIRST FEW MOVES

Get to know the gap.

A sliding puzzle rewards a different
kind of attention.

THE RULE

Fifteen numbers. One empty seat.

Read the finished board like a page: 1–4 in the first row, then 5–8, 9–12, and 13–15 with the gap last. Each turn slides one tile horizontally or vertically into that gap. You cannot lift a tile out, jump over another, or swap two numbers.

GET YOUR HANDS ON IT

Tap a neighbor. Start a thought.

On a phone, tap any outlined tile beside the gap. With a keyboard, focus the board and press an arrow in the direction you want a numbered tile to travel. The timer waits for your first move. Pause whenever you need a break; your unfinished board follows you between these two pages in the same tab.

A SLIDING-PUZZLE HABIT

Plan the empty space, too.

A number can be one square from home but still have no way in. Before moving it closer, find a route for the empty space to get behind it. Try arranging 1 and 2 first, then treat 3 and 4 as a pair. Clearing a row together works better than chasing whichever tile looks easiest.

Practice the row-by-row approach
FIND YOUR STARTING POINT

One board, three kinds of challenge.

Easy begins just ten legal slides from the finish. Medium and Hard spread the tiles farther, asking you to leave room for bigger cycles. These shuffle lengths are not shortest-solution promises. The related 8 Puzzle uses a 3×3 board. Choose a size in the sliding puzzle collection; each full game has three difficulties and optional hints.

Need help seeing a route? Hint reveals one move at a time. Assisted bests have their own record, so your independent solves keep their place.

A SMALL PAUSE WITH A PURPOSE

Give your curiosity
somewhere to wander.

Here, the challenge comes from the puzzle itself: seeing how pieces fit, planning a few moves ahead, and trying a new route when the first one doesn't work.

Our four engines are made from scratch: slide numbers, place shapes, sort colors, or clear a block’s exit. Each has its own kind of planning. Take your time.

Learn how the tiles fit together