How to play Water Sort
Each tube holds up to 4 layers of colored water. Tap a tube to pick it up, then tap another tube to pour. Water only lands on the same color or in an empty tube, and the whole matching layer on top moves at once if there is room. Sort the water until every tube holds a single color.
Levels, undo and hints
There are 60 levels. The first 3 use 3 colors, then the count climbs to 4, 5, 6, 7 and 8, and the last levels use 9 colors. Every level adds two empty tubes, and each one is checked to be solvable. Undo takes back pours one at a time with no limit, and Restart starts the level again.
Hint works out a real solution from where you stand and highlights the two tubes to use next. Using a hint caps that level at 2 stars. The Symbols button adds a shape to each color if the colors are hard to tell apart.
Stars and saving
Finish in the par number of pours or fewer for 3 stars. Up to about a third more than par earns 2 stars, and anything over that earns 1. Your best result for each level and the levels you have unlocked are saved in this browser.