Tidy Shelf

Goal Empty every shelf by matching three alike.

1. Drag an item to a shelf with a free spot. Or tap it, then tap the shelf.
2. An item only goes next to the same item, or onto an empty shelf. Plan where each set will meet.
3. Three alike on one shelf tidy away.
4. The darker row behind steps forward when the front row is empty.
5. A locked shelf shows a number: it opens after that many sets.
6. Fewer undos, more stars.