Line Of Defense is a sci-fi MMOG (Massively Multiplayer Online Game) in which thousands players fight for the control of various bases located on planets in the far reaches of space. The game is played in either first (FPS) or third (TPS) person perspective as infantry or in land and naval vehicles, as well as aircrafts (fighters, gunships) – some with the capability to travel to space and back, and vice versa.

In the game, you can play as either a GALCOM military marine or an Insurgent soldier. The primary objective is to gain control of each of the four bases on the continents. You will take over bases by either destroying or hacking into and disabling their defense systems, thus making them vulnerable. You will do this 24-7 and 365 days a year on the Lyrius planet or in the space region above it – and all within a 100% persistent universe.