It's an online game where your a miner on another planet and you send this transium stuff back to earth cuz it can be used for like everything and you get money for it. There are 1million camps you can have and each has 5 transium deposits. You are one of four mining corporations and each has different weapons and stregths and buildings/turrets and stuff and you fight each other for land so you can mine more and get rich. The game goes on 24/7 and your camps can get attacked all the time. Thats where having an MDN (mutual defense network) comes in. 20 members per mdn and whoever is online gets an alert when an enemy enters another members camp. They take their rovers (robotic fighters that you build and control) to defend their mdn members camps. It's pretty badass but you have to play it to understand.