#2 Crossfire
Developer: Smilegate
Released: 2007
Revenue: $7.13 billion
Crossfire is a free tactical shooter that has achieved immense popularity in South Korea and China. The top grossing game of 2014, when it pulled in $1.3 billion in revenue, Crossfire is among the highest grossing video games of all time because makes money through the sale of virtual items, buffs, and other bonuses. The game’s popularity has led to a deal to produce a major motion picture based on it, which will involve Neil Moritz of Fast & Furious fame. The movie has yet to see release, and is not to be confused with another, rather uninspiring looking CROSSFIRE movie that was released in 2015, which does not appear to have any connection to the game.