A new smartphone game developed by two Britons, one an award-winning novelist, with funds raised by crowd-sourcing and no budget for marketing, has become the world's highest-grossing health and fitness app during its first fortnight of release, beating even such giants as Nike.
Released just weeks ago, Zombies, Run! describes itself as "an ultra-immersive running game for the iPhone, iPod Touch, and Android" with a narrative edge.
Instead of focusing on fitness, it casts the user as the struggling survivor of a zombie apocalypse. Players undertake sorties to gather supplies, with the drama playing out in fully scripted audio; success is measured in further segments of the unfolding story.
Sales are expected to top £100,000 ($194,000) soon, despite the full version costing more than £5, and media specialists say the game's success has many lessons for the industry.
The game is the brainchild of Adrian Hon, founder and head of London games studio Six to Start; and Naomi Alderman, Orange prize-winning novelist and game writer.