You can use experience points in two ways. As you kill aliens and evolve to the next stage, you will also earn experience points. Your collector collects water and converts it into money, the farther away he is, the more money he earns. These towers need to use money to build and make money by sending collectors to one of the three wells on the map. You need to build towers to start the training units. You will start with the simplest things (stone age and your units including the spear and catapult user) along with some dinosaurs and grow your army until you have Sufficient ability to fight aliens. Aliens have advanced technology, but this planet is yours, you have the power and terrain advantage so you can get ready to face them.
Your planet is being invaded by aliens and you must prevent this invasion by all means. Your mission is to build units and develop your base to defeat the enemies. Army Of Ages is an extremely interesting tower defense game.
