Tube Sort · Liquid Sort Puzzle Game
Tube Sort is a colour sorting puzzle: pour liquid layers between tubes until every tube holds a single colour. Every level is built backwards from a solved state, so it can always be solved — but the clock is running and colours keep being added.
How to play Tube Sort
- Tap a tube to pick it up, then tap another to pour.
- You can pour onto the same colour or into an empty tube, up to 4 layers.
- Sort all the tubes before the timer runs out; you get 3 undos per level.
Controls
Tap tubes — or keys 1–0, Z to undo.
Tips & tricks
- Keep an empty tube free as long as you can — it is your working space.
- Finish one colour at a time instead of moving layers back and forth.
Tube Sort is free to play online in your browser on phone, tablet and computer — no download, no sign-up. Your best score and trophies are saved automatically.