Stalker Online is a post-apocalyptic MMO that focuses on survival. It has a complex leveling system where you can develop combat skills as well as development and construction skills. Care needs to be made on how you level your character, based on your gameplay style. You can build a base, and outfit it with defenses, or various facilities that help quality of life. Each zone in the game has its own anomalies and mutants, which can shift and change over time. Exploration is rewarded in the game, however, it is also very risky due to the changing areas and the different types of mutants you can encounter.