Master Blender is a water-sorting puzzle with a bartending theme: bottles hold layers of mixed colours, and you pour from one to another until every glass contains a single colour.
Liquid only pours onto matching colour or into an empty glass, which is the constraint that makes it a puzzle. The empty glasses are your working space, and running out of them is how a level fails.
You can only pour onto the same colour or into an empty glass, and the receiving glass must have room. That constraint is what turns it from stirring into a puzzle.
Keep an empty glass in reserve. Filling every glass leaves you with no working space and no legal moves.
Yes — tap to pour. Nothing to install.