Piles of sand sit on a board. Tap to add a grain, let four topple onto their neighbours, and topple every gold-ringed pile before the taps run out.
One grain
Tap a pile and it gains one grain; the dots on each pile show how many it holds, from none to three. A pile that reaches four topples: each of its neighbours gets one grain, and grains pushed off the edge are lost.
Chains
A topple can tip the next pile, and the next. A single grain placed at the right spot can send a cascade across the dune, while a careless one tips nothing at all. Each ring turns from gold to green the first time its pile falls.
Five dunes
Five dunes grow from a two-tap warm-up to a four-tap cascade, and each one can be cleared inside its tap budget. Undo takes back your last tap; Restart resets the dune. When every ring is green, tap Next. On the last dune, Again returns to the first.
Controls
Tap a pile to add a grain. Tap Undo, Restart or Next as needed. On desktop, click instead of tapping.
