A relaxing water-sort puzzle. Four colours are shuffled across four tubes, plus two empty tubes to work with. Pour balls between tubes until each tube holds only one colour.
Rules
Click a tube to select it (its border turns yellow), then click another tube to pour.
A pour is only legal onto an empty tube, or onto a tube whose top ball matches the colour you’re pouring.
Click the same tube twice to deselect it.
Sort every colour into its own tube to win.
Tips
Empty a tube first to use as a buffer — you need breathing room to sort. Work on one colour at a time rather than jumping between several half-finished tubes.