The stage is cleared when all products are sorted by type. Each shelf has a maximum capacity and no more can be placed. Only products of the same type can be placed next to each other. The faster you clear a stage, the higher score you get.
You can clear a stage by sorting all the products by type. The faster you clear a stage, the higher score you get. Stamps are accumulated according to your score, and the more stamps you accumulate, the more types of products you can sort.
Tap to hold. Tap to place.