Since going free-to-play earlier this week, Sony Online Entertainment's DC Universe has picked up an extra 120,000 registrations on PC.
That's according to SOE boss John Smedley, who also noted that concurrent users are up by four times as much. To increase take up, the company is also planning a big TV and online advertising push this month.
DC Universe Online for both PC and PlayStation 3 is the latest massively multiplayer game to go free-to-play after originally launching with a subscription model.
Last month Smedley wrote for GamesIndustry.biz, stating that he believes free-to-play models are the future of online gaming, breaking down barriers to entry for new players and levelling the playing field for smaller development teams that no longer have to deal with traditional retail channels.