The game in question is CSR Racing from Zynga. It was released in 2012. The Apple App Store offers users to purchase a Ford Mustang Deluxe pack for $3. This move, according to the Pocketgamer resource, is part of Apple’s long-term strategy to attract users’ attention to premium, or, in other words, paid content.
The CSR Racing title is present in the Google Store. But there is no pak yet. Which indirectly proves that Apple is going to promote only its own “exclusive” content in this way.
A source: http://www.pocketgamer.biz
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