Seemingly anyone can have a hit with a free iPhone game, but how do you make money out of it?
Indie developers Danielle Cassley and Jason Citron might just be providing a blueprint for their peers, with the release this weekend of Aurora Feint II: The Arena.
It follows the enduring popularity of the first Aurora Feint game, a free iPhone title that offered a Puzzle Quest style mix of block-matching and character development.
What's interesting about Aurora Feint II is firstly that it's a premium title £4.99 aiming to capitalise on the huge audience that downloaded the freebie prequel.
But it's also interesting for the features it throws in to justify that price difference specifically the asynchronous multiplayer element, where players upload ghosts of their best performances to duel against each other.
With chat, news feeds and player profiles around that. At a time when there's been something of a backlash against the thousands of bedroom-developed indie games on the App Store, Aurora Feint II shows the silver lining to that crowd.