Team Fortress 2

Team Fortress 2, the multiplayer first person shooter developed by Valve Software, has earned $139 million in microtransactions. Similar to its predecessors, this theme also revolves around two opposing teams competing for a goal. The two teams represent destruction and a construction company Reliable Excavation Demolition and Builders League United. This game features several achievements for performing certain tasks, such as achieving certain number of murders or finishing certain round within specific time.

Counter-Strike Online

Counter-Strike Online, the game developed by Nexon, has generated $121 million revenue in microtransactions. This game includes additional features such as preface of female characters, various new weapons and skins for earlier weapons. This game is free to play, but certain weapons are available to purchase using real money. These weapons will expire after some time, but can be purchased during a promotion. Certain weapons can be purchased using points that are achieved by gaining kills, completing rounds, and so on.

READ MORE: How Google Can Plan Your Healthy Meal! and Beware! Cell Phone Texting Bad For Heart