Water Sort

🕹️ How to play

1. Start pouring: Level 1 is ready the moment the page opens — no start button, no sign-up. Tap a tube to pick it up, then tap another tube to pour the top colour into it. On a computer you can also press 1–9 to pick tubes.
2. Know when a pour is allowed: You can pour onto an empty tube or onto the same top colour, as long as there is room. The whole top run of one colour moves, as much as fits. Illegal taps shake the tube and the message bar tells you why.
3. Finish the level: Fill each tube with four layers of one colour — it gets a cork stopper — until every tube is either full of one colour or empty. The Par chip shows the shortest known solution.
4. Fix mistakes: Undo is unlimited and free, and even Restart can be undone. Out of moves? Tap Hint to see which tube to pour next, or add one empty tube per level.

📖 Rules & variants

Water sort rules: each tube holds four layers. You may only pour the top run of one colour, onto an empty tube or a tube whose top layer is the same colour, and only as much as fits. Every pour counts as one move; a refused pour does not.

Winning: a tube with four layers of one colour is sealed with a stopper and can't be poured from again. The level is solved when every tube is sealed or empty — a colour spread across half-filled tubes does not count.

Stars: finish within par for 3 stars, within par + 3 moves (or par + a quarter on long levels, whichever is more) for 2 stars, and any finish earns 1 star. Using a hint or the extra tube caps that attempt at 2 stars; undone moves don't count.

No moves left: when no pour makes real progress, the board dims, the message bar says so and the Undo and +1 tube buttons pulse. The level is never lost — undo is free and the position is fully reversible.

100 levels in four tiers of 25 — Starter, Easy, Tricky and Master — going from 2 to 8 colours, with some later levels giving you only one empty tube. Every level is unlocked; the level picker shows your stars, best move count and unfinished boards.

Water sort strategy: an empty tube is your most valuable resource, so don't fill it casually. Merge colours onto tubes that already have them, prefer the pour that seals a tube, and check the layer underneath before you pour. When stuck, undo before reaching for help.

❓ FAQ