Sort the liquids — and make the ones you are missing.
Every mixing level hands you fewer ingredients than whole bottles hold. The colour you need does not exist on the bench — you have to make it.
No level ships until a solver has finished it and recorded the shortest route. Three stars means the shortest route, not "as well as the tool did".
Lab chains run three or four rooms deep. At the door you choose what comes with you, and what you leave behind stays behind.
Every liquid has a shape as well as a colour, so the game is playable without relying on telling red from green.
Color Lab is built for an audience that includes children. It never asks for a tracking permission, never requests an advertising identifier, and serves only non-personalised ads, rated G. Ads are optional: they are offered in exchange for something — a hint, some gold — and never shown to interrupt a board. The privacy policy says exactly what is stored and where.