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Three ways to play: climb the Levels, chase a high score in Score Rush, or just relax in Zen mode. Every board is generated solvable.
Levels is an endless ranked progression from three to twenty colors, with increasingly large boards and later mystery layers. Score Rush is the leaderboard mode: boards keep coming, +30 per completed flask and +150 per board, but no undo and no extra flask - one mistake chain and the run is over. Zen lets you pick a smaller board, use Undo or an extra flask, and simply sort forever.
Water Sort Puzzle is a color sorting game: each tube holds four units of colored water, and you pour the top color onto a matching color or into an empty tube until every tube is a single color. This page answers searches for water sort puzzle online, color sort game and liquid sort puzzle with a free, no-download browser version.
Tap or click a tube to lift it, then tap another tube to pour. You can only pour onto the same color or into an empty tube, and only as much as fits. Restart a Levels board to retry its exact deal; Zen mode also offers Undo and one extra flask.
Each Levels board uses a fixed seed and is assembled through reversible pour sequences, so it comes with a legal path to a full sort without slow trial-and-error generation. If you get stuck, restart the deal and try a different order.
Open with pours that expose long runs of one color, keep one empty tube free as a workbench, and avoid burying rare colors under mixed stacks. Counting the four units of each color tells you which tube can be completed soonest.
Tubes are sized for phones and desktops, pour animations stay short, and the fullscreen button removes every distraction. Your level, solved count and fewest-moves records are saved in your browser.
Levels start with three colors and climb to twenty colors in twenty-two flasks. Concealed lower layers arrive gradually, then later boards show only each exposed top run until it is poured away. The LEVEL arrows let you replay any board you have unlocked.