iOS app Infinity Blade is Epic Games' most profitable title ever, based on man years invested versus revenue, CEO Tim Sweeney has said.
Speaking to Gamasutra, Epic's founder claimed the hack 'n slash mobile title is even "more profitable than Gears of War."
That's why, just like rival Crytek, Sweeney now believes the future of gaming will be fuelled by free-to-play.
"I agree that this is going to be the way that almost all games will be distributed worldwide," he said.
"All these western developers spending 30 million to develop these games for dedicated consoles - all of these companies are going to be invading the Asian markets within the next five years or so and they'll be free to play, worldwide, global products. ... The only way to survive is to go global."
At the same time, the Epic boss said he's been "very very surprised to see how fast smartphone and tablet devices are improving," and - again, like Crytek - he expects near-future tablets to approach the performance of current-gen consoles.
"We expect DirectX technology to be widely available on these mobile devices in the next few years," he said. "We're also seeing an interesting thing happen in terms of the overall development pattern globally."