Merge Plants: Aliens Defense is a strategy game that is completely free to download and play. In this game, you need to help the plants and animals to get rid of the alien monsters that have attacked the Earth. To do that, you need to open the treasure chests that are in the game and you will receive different kinds of powerful weapons. These weapons will help you in the battle that you will have with the monsters. You need to open the treasure chests and get the weapons so that you can use them to help your plants and animals.