Liquid Link

Liquid Link is a colour-sort puzzle with a catch: every pour needs a path.
Tap a glass, then tap another. Liquid runs down a pipe between them — but only if the colours match and the route is clear. Glasses block the way, and a pipe bends twice at most. Fill a glass with a single colour and it clears itself, opening routes you couldn't use before.
Undo, Shuffle and Add Glass get you unstuck. Every level is built to be solvable. No timers, no lives - think as long as you like.