According to the research firm, with Apple's in-app billing mechanism showing the way forward, total end-user revenues will surpass $11 billion annually by 2015, nearly double what they were in 2009 ($6 billion).

An increasing number of games are being offered free at the point of purchase, in order to garner attention, with in-game purchases - which include extra gaming levels or gameplay items - being utilized by developers and publishers to monetise the game once the user has been given a taste of what the game has to offer.

However, discoverability remains a problem for developers and publishers on some app stores, given that many now contain 100,000s of applications, the majority of which are mobile games, said the research firm.

Daniel Ashdown, research Analyst at Juniper Research, said: “Discoverability can be a 'chicken and egg' problem: high downloads lead to prominence, but achieving a high number of downloads is largely dependent on already being prominent. Consequently, a small minority of games achieve very high downloads, whilst the vast majority achieve very small download figures.”

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