Play free online — no downloads, no installs.
Water Sort is a free online colour-sorting puzzle. Pour the coloured water between glass tubes until each tube holds a single colour. Every level is guaranteed solvable, with an undo button and three difficulties — a calm, tidy brain-teaser you can play on phone or desktop with no download and no sign-up.
Keep an empty tube free as workspace instead of filling it early. Look for a colour split across two tubes that can be reunited, and avoid burying a colour you will need — pour onto the taller matching stack so short tubes stay flexible.