Seattle-based iLike said late Thursday that the firm's iLike Challenge App is now on Apple's App Store. The app, which runs on the iPhone and iPod touch, is a game which sees how quickly music fans can identify songs from Sony artists. The game is linked to iTunes, and allows users to purchase songs they hear in the game. The firm has a deal with Sony Music Entertainment to use its titles in the iPhone app; no details on the business arrangements between the firms was announced. iLike said the App will cost $2.99.