Sliding Puzzle Online — Klotski Blocks for Kids 5–10
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Klotski is the classic sliding puzzle where nothing is ever lifted off the board. Blocks of different sizes are packed into a box with one gap, and every move slides a single block along the free space in one direction. One block is the prize — the big 2×2 chest — and the whole puzzle is about clearing a road for it to the exit slot.
84 levels, and every one knows its own shortest solution
Before a level ever reached the game, a full breadth-first search walked its entire state space and counted the true minimum number of moves. That number is exact, not an estimate — which is why the game can honestly tell a child when a solution is the shortest one and not merely a solution. The curve runs from levels solvable in a single move to positions that take sixty.
From 3×4 up to the classic box
Five starter levels sit on a small 3×4 board, fourteen more on 4×4. The heart of the game is the classic 4×5 box — forty-seven levels of it — followed by eighteen on 5×5. Level 84 is the real thing: the authentic historical arrangement, which takes ninety moves to crack.
Nothing punishes a wrong move, because a wrong move is just a move
You cannot make an illegal move here — a block either has room to slide or it does not. So there are no mistakes to scold, and the game does not scold. What it does is count. Undo steps back one move and rolls the counter back with it, restart puts the level back the way it started, and stars are given only for finding the shortest road. Ask for a hint and the level can still be finished — it simply tops out at two stars.
Every level is spoken
The rule is explained aloud the first time you play, and never again after that. From then on the voice reads out the task at the start of each level and says a word when the chest reaches the exit. Nothing is narrated move by move — the room stays quiet while a child is thinking.
How to play
Press a block and drag it in the direction you want it to travel; it slides as far as the free space allows and stops. One drag is one move, however far the block went. There is no rotating, no lifting and no jumping over anything — this is a puzzle of space, not of dexterity. Undo takes back the last slide, restart resets the level, and your progress is stored on the device so the next session opens where you left off.
What your child learns
Thinking several moves ahead, which is the whole point of the puzzle: the chest cannot move until a road exists, and the road cannot be built without moving blocks that are currently in useful places. A child learns to hold a plan in mind, to notice that a move which looks like progress has just sealed the only exit, and to back out of a dead end without starting over. It also trains a very physical kind of spatial sense — reading how a shape will fit through a gap before it is dragged there. There is no arithmetic in this game; it is pure logic and space.
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.
- Prins et al. (2013). “Braingame Brian”: toward an executive function training program with game elements. Games for Health Journal.
- Tokac et al. (2019). Effects of game-based learning on students' mathematics achievement: A meta-analysis. Journal of Computer Assisted Learning.
- Alotaibi (2024). Game-based learning in early childhood education: a systematic review and meta-analysis. Frontiers in Psychology.
- Lampropoulos & Sidiropoulos (2024). Impact of gamification on students' learning outcomes and academic performance: a meta-analysis. Education Sciences.
- Taylor & Boyer (2019). Play-based learning: evidence-based research to improve children's learning experiences. Early Childhood Education Journal.
- Gottfried (1990). Academic intrinsic motivation in young elementary school children. Journal of Educational Psychology.
FAQ
How do you solve a Klotski puzzle?
Work backwards from the exit. Decide which squares the big block must pass through, and see which blocks are sitting on that road. Those are the ones that have to move, and the puzzle becomes the question of where they can go instead. Solving forwards — sliding whatever is easiest to slide — almost always ends in a jam.
How many moves does the classic puzzle take?
The historical arrangement in this game, level 84, is solved in ninety moves by our counting, where one slide of one block in one direction counts as a single move however many squares it travels. Books often quote 81 or 116 for the same position because they count differently — a square at a time, or a change of direction as a new move. The position is the same; only the ruler differs.
What are sliding block puzzles called?
This family is usually called klotski, or by its Chinese name, and it is closely related to the sliding tile puzzles with numbered squares. The difference is that here the blocks come in several shapes and sizes, and one particular block has to reach a particular place — not every piece needs sorting.
Is there always a solution?
Yes, for every one of the 84 levels — each was solved by exhaustive search before it was included, and the game knows the shortest route. If a position looks hopeless it is not; it is just a position that needs undoing rather than pushing.
What age is it good for?
Around 5 to 10. The first twenty levels are small boards a five-year-old can finish by nudging blocks around, and they teach the feel of the puzzle. The 4×5 and 5×5 chapters are genuine thinking work, and the last level defeats plenty of adults.
Does it work on a tablet?
Yes — dragging a block with a finger is the natural way to play it, and arguably nicer than a mouse. The board resizes to the screen in both orientations.
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By Evgeny Arsentiev, PhD · Last updated: September 2026