Pouring a tile onto another tile of the same value merges them into a single tile of double that value, in the same way 2048 combines matching numbers. Two fours become an eight, two eights become a sixteen, and so on.

Onto a tube whose top tile matches your value, or into an empty tube. It is the same restriction as a water sort puzzle, with merging added on top.

Look for chains before you pour. A merge that immediately creates a tile which can merge again, and again, covers far more ground than several isolated merges. Pours that neither merge nor set up a merge are usually wasted moves.

Each level sets a target value to reach before you run out of moves. Undo, restart, boosters and a shop are available if a level proves stubborn.