The market for tablet and smartphone titles surged 10 percent to $25.1 billion from the previous year.

The mobile space continues to be dominated by a handful of high earners. The top 10 games in the segment accounted for nearly a quarter of total revenue.

The big moneymaker in absolute dollar terms was PC-based gaming, which includes free-to-play titles, subscription-based games, social games like "Farmville," and other downloads. Games on the platform pulled in $32 billion in 2015.

There were signs of weakness in the category, though. Social gaming was down marginally, and subscription-based titles slipped 4 percent as free-to-play games — which earn their developers money from premium in-game purchases — continued to dominate PC sales.

Riot Games' "League of Legends" was the top dog among free-to-play games. The multiplayer online battle arena game earned $1.6 billion in revenues — seven times more than its closest competitor in the genre.