League of Legends generated more than three-quarters of a billion dollars in revenue last year, research firm Superdata reports.

According to the digital game market intelligence firm, Riot’s MOBA cleared US$624 million (NZ$755m) in revenue through 2013, but it wasn’t the biggest money-maker in the free-to-play space.

That honour went to South Korean shooter CrossFire, which generated US$957 million (NZ$1.2b) last year.

Nexon’s Dungeon Fighter Online was third at US$426 million, World of Tanks fourth at US$372 million, and Maplestory fifth at US$326 million.

Confusingly, Superdata lists World of Warcraft at seventh on its free-to-play table with US$213 million in revenue.

Behind that is Star Wars: The Old Republic with US$139 million in revenue, Team Fortress 2 with US$139 million, and Counter-Strike with US$121 million.

The US digital games market grew 11 per cent overall in 2013, reaching a total of $11.8 billion in sales.