Docking Donuts2 in 1

You should sell the donuts ordered. You'll be supplied with donuts one by one. Then you just lay it in the tray. Of course, you should not lay it carelessly. To sell and get money, Just put three or more donuts together then the donuts will be sold(removed). As time goes on, the screen will be filled with the donuts from the bottom. Sell the donuts ordered before it is overflowing.