We’ve seen some interesting mobile apps built on Spotify’s API recently, but here’s one using Deezer. Orange Labs – the R&D division of telco Orange – has launched iPhone game What’s That Track? following its Android release last year. It’s a music quiz game that gets players to identify more than 700 tracks or artists sorted by genre. And Deezer? “You may also create you own quizzes just by using Deezer playlists. Answers will be automatically generated,” notes the app description. “Send your quiz proposal by clicking ‘suggestion’ on the game home screen. If your quiz is selected, it will be integrated in a future game update!” An interesting idea. The app is free to download and play.