Apple's App Store now features over 13,000 games for the iPhone, accounting for over 20 per cent of applications on offer for the handset.
At the time of writing, free titles account for 22.6 per cent of games on offer, with paid for games making up the majority 77.4 per cent, according to Mobclix.
The largest genre is for puzzle games, accounting for 16.4 per cent of games, followed by action and arcade titles, which make up 11.2 per cent and 11.1 per cent respectively.
The number of games available has more than doubled since March this year, when there were over 6000 games on the service.
The most popular free title at the time of writing on the App Store is iHandgun, while Hero of Sparta by Gameloft is the most popular paid for game.