Auto watches how you play and adjusts: clean solves near par make the next puzzle harder, hints and restarts ease off.
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How to play
One color per tube
Tap a tube to pick it up, then tap another to pour. You can also drag from one to the other.
Liquid only pours onto the same color or into an empty tube.
The whole top color pours at once, as much as fits.
A tube is done when it holds all 4 of one color. It gets a cork.
Later chapters add twists: tall and short tubes, tubes with a colored rim that only take that color, locked tubes that open when a tube of the lock's color is finished, and move limits (undo gives moves back).
Par is the move count for three stars. Hints and the extra tube each cost a star, undo is free.
Keyboard: 1–9 pick tubes, Z undo, R restart, H hint.