Your mission in Cover Orange Journey Pirates is to keep your oranges safe by tucking them away under ledges or otherwise covering them with treasure chests or whatever else happens to be laying around.
In the upper corner of the screen, you'll see the objects you have to drop during for the level, including sometimes needing to drop the oranges themselves. You'll also see a line dividing the screen horizontally. Everything you drop must be released from above this line. After you've used up all your objects for the level, the rain cloud comes by. If the oranges are properly covered, you pass the level, if not, you have to try again. You earn some stars for finishing quickly, but also be on the lookout for one hidden star you'll have to click on that appears only when the cloud is overhead.