My accountAccount
Game subjects
My account
Brain & Logic 82
Math 44
Reading 22
STEM & Physics 9
Spanish 8
Puzzles 6
Chess 1
Educational Games for Kids 0
Free Online Games for Kids — No Download, No Sign-Up 0
Learning Games for Kids: Where to Start at Every Age 0
By age
4 Year Olds: First Screen Learning That Actually TeachesPreschoolers: Twelve Minutes, One Skill, No Ads5 Year Olds: From Letter Sounds to Real WordsKindergarteners: The Five Skills That Decide 1st Grade1st Graders: What This Year Actually Covers6 Year Olds: Reading Sentences, Adding Past Ten2nd Graders: Regrouping, Arrays and the Clock7 Year Olds: Times Tables, Clocks and Coins3rd Graders: The Times Tables Year8 Year Olds: Division, Fractions and Real ScienceLearning 4th Graders: Long Division and Fractions That Match9 Year Olds5th Graders: Decimals, Order of Operations, First Algebra

15 Puzzle Online — Slide the Numbers Back into Order 6+

Save your child's achievements An account keeps every bit of progress safe. No newsletters — your email is used for progress only.

Create account
A knight faces cartoon monsters with his shield, keeping a child safe behind him New from Dad4Kids Clean YouTube for kids For families with traditional values, hand-picked by parents. Open →

The 15 puzzle is the 1880 classic: fifteen numbered tiles in a 4×4 frame, one empty square, and one rule — slide a neighbour into the gap until the numbers run 1 to 15 in order.

Eighty levels grow with the child: twenty on the 3×3 frame (the eight puzzle), twenty on the classic 4×4, then 5×5 and 6×6. Some levels ask only for the first row or the last two, and sixteen replace the numbers with a picture — a rocket, a whale, a castle, a balloon — cut into tiles.

How to play

  1. Look at the empty square: only a tile touching it can move.
  2. Tap that tile and it slides into the gap.
  3. Build the top row first, then the next one — a finished row is easier to keep than to rebuild.
  4. Stuck? Restart the level and try another order; the solution is never shown for you.

What your child learns

The science behind the games

Every Dad4Kids game is built on one simple truth: children want to play, not study — so we turn learning into a game worth replaying. The method draws on peer-reviewed research in game-based learning, motivation, and how memory works.

FAQ

Can every 15 puzzle be solved?
No — exactly half of all random arrangements are impossible to finish, because sliding tiles can never change the parity of the permutation. Every board in this game is produced solvable and checked by the generator, so you never grind on a puzzle that cannot come out.
What board sizes are in the game?
Four: 3×3 (the eight puzzle) for the first twenty levels, then the classic 4×4 with fifteen tiles, then 5×5 and 6×6 for children who want a long, patient task.
How do the tiles move?
Only the tiles touching the empty square can move, and they slide into it — tiles never jump over one another or swap places. That single restriction is the whole puzzle.
Are there picture levels as well as numbers?
Yes, sixteen of the eighty. The numbers are replaced by a picture cut into tiles — a rocket, a whale, a castle or a balloon — so the order has to be read from the image instead of from the digits.
Does the game show the answer after a mistake?
No. There is no move that cannot be undone by sliding back, so a level can always be restarted; the finished arrangement is never played out for the child.

More free games for kids

What game should we build next?

Tell us what game your kid would love — describe it in a sentence or two, and we’ll build it. Free, right here on Dad4Kids.

Leave your email and we’ll send you the link when the game is ready.

Got it! We read every idea — thank you!

Check back in a couple of weeks — your game might be here.

By Evgeny Arsentiev, PhD · Last updated: September 2026