CrossFire was the world's top-earning free to play mmo in 2013
CrossFire earned nearly a billion dollars -- or a whopping $957 million to be exact -- last year.
This was enough to make CrossFire the Top 1 online game by free-to-play earnings in the world, according to data from SuperData.
See the graphic chart below for the Top 10 online games by free-to-play earnings:
But newer entrants to the free to play sphere such as World of Warcraft and Star Wars: The Old Republic are making great headways. Both had transitioned to the free to play model, effectively diversifying their revenue stream beyond solely relying on subscriber revenues.
Valve's MMOFPS titles also continued to show strength, capturing the ninth and tenth spots with Team Fortress 2 and Counter Strike Online, respectively.