A calm but clever color sorting puzzle: pour colored water between glass tubes until every tube holds a single color.
How to Play
Each level starts with tubes full of mixed layers of colored water, plus two empty tubes to work with. Tap a tube to lift it, then tap another tube to pour. Water can only be poured onto the same color or into an empty tube, and a pour moves as much of the matching top layer as the other tube can hold. Changed your mind? Tap the lifted tube again to put it back.
When a tube is filled with four layers of one color, it is sealed with a cork and stays locked for the rest of the level. Seal every color to finish the level.
300 Levels, From Relaxed to Tricky
The first level uses only three colors, so the rules are easy to pick up. New colors are added as you progress, up to twelve in the later stages, where planning several pours ahead becomes essential. Every level has been checked by a solver to confirm it can be completed, so if you get stuck, the way out is always there: undo a few moves, or restart and try a different plan.
Mystery Levels
From level 12 onward, every fourth level is a Mystery level. Only the top layer of each tube is visible, and the layers below show a question mark until they reach the top. You have to make room and uncover colors as you go, which turns a familiar puzzle into a test of memory and patience. Mystery levels are marked in purple on the level map.
Helpful Tools
- Undo: take back a pour if it did not work out. You get five undos each time you play a level.
- Hint: shows a good next move with an arrow from one tube to another. Each level comes with three hints.
- Extra tube: adds an empty tube when you need more space. One is available per level, and a second can be added if you are still stuck.
- Restart: puts the level back to its starting position.
If you run out of undos or hints, you can refill them and keep playing.
Stars and Scoring
Each level has a target number of moves. Finish within the target without using a hint or an extra tube to earn three stars. Going over the target costs one star, and using a hint or an extra tube costs another, but every completed level earns at least one star. Your moves, the target and your current star rating stay visible at the top of the screen while you play.
Comfortable on Every Screen
The game runs on phones, tablets and computers. Play with touch or a mouse, or use the keyboard: Z or Backspace to undo, R to restart, H for a hint, T for an extra tube and Esc to put a lifted tube down. A color-blind mode adds a distinct symbol to every color, so tubes can be sorted by shape as well as by color.
Progress is saved automatically on your device. The level map shows the stars you earned on every completed level, and replaying a level keeps your best result, so you can come back later and chase three stars.