The PC gaming utility, Raptr, is normally used to optimize in-game settings, chat and socialize, and record game footage. It also keeps track of game-hours and aggregates them into a list once per month, which makes it one of the few sources for this type of data on the PC. We were late on it last month, which means that another was posted just a week later.
April marks the release of Grand Theft Auto V for the PC. It went live on the 14th and, despite only counting for half of the month, ended up at 4th place. Next month's survey will tell us whether the post-release drop-off was countered by counting Grand Theft Auto for a full month, which is double what they have now. It was just 0.17% of global play time behind CS:GO. Despite an error on the graph, it knocked DOTA 2 down to fifth, and Diablo III down to sixth. In fact, just about everything below Grand Theft Auto V dropped at least one rank.
Only three games actually gained places this month: ArcheAge, Warframe, and Spider Solitaire. Yes, that game is now the 19th most played, as tracked by Raptr. You could sort-of say that Hearthstone gained a rank by not losing one, but you would be wrong. Why would you say that?
League of Legends dropped less than a percent of total play time, settling in at about 21%. This is just about on target for the game, which proves that not even Rockstar can keep people from having a Riot.