📘 How to Play Long Cat

Long Cat is a slide-and-fill puzzle. The cat slides in the direction you choose and cannot stop on its own: it only halts when it hits a block, the edge of the board, or its own body. Every tile it crosses is filled by its body and can never be crossed again. The goal is simple but sneaky: fill every empty tile on the board.

1. Pick a direction. Arrow keys, WASD, or a swipe on a phone. The cat travels until something stops it.
2. Think about where it will land. The cat cannot stop halfway — picture the landing spot before you slide.
3. Don't waste the corners. Skip a corner and you may find there is no longer a way back into it.
4. Went wrong? Undo. Undo is unlimited, so no mistake is permanent.
5. Really stuck? Hint. The hint is not a random arrow: the solver built into the game works out a direction that still leads to a solution from where you are, and points at it.

🧠 What does it teach?

The heart of this game is planning ahead. A child has to picture the result of a move before making it — the same "hold it in your head" skill used in mental arithmetic and reading. A wrong order leaves a corner that can no longer be reached, and the child discovers this after a couple of tries. It also exercises sequencing (which area first), spatial reasoning (how far will the cat go) and patience.

♾️ Where do the levels come from?

The levels are not read from a prepared list — the game builds them on the spot. But it does not sprinkle random blocks: each level is constructed backwards from its own solution, and then the solver inside the game solves the board from scratch to prove it can be finished. So you can never land on an impossible level: if you are stuck, a solution exists and only the order was wrong.

Difficulty is set by measurement, not guesswork. For every level the game computes how many moves are needed and what share of positions can no longer be completed. The game asks your age when it starts (4-5, 6-7, 8-9, 10+) and shifts both the board size and the risk curve to match. Pick 4-5 and that share is zero for the first 14 levels — the child cannot lose whatever they do, they simply learn the mechanic; pick 10+ and the puzzles start on bigger boards and are real puzzles from level one. You can change the age any time with the 👤 button at the bottom. Whichever you pick, the first level can never be lost and no two consecutive levels are the same board.

👪 For parents

The game has no ads, no sign-up and no outside links. Your level progress is stored in the browser, so you carry on where you left off. When playing with younger children, asking "where do you think the cat will stop?" turns a silent puzzle into a thinking-out-loud exercise.