A new “Only on the App Store” promotion has made a number of top iOS apps and games free from iTunes. Infinity Blade II, Where’s My Water?, Badland, Tiny Wings for iPhone and iPad, Superbrothers: Sword and Sorcery EP, Day One, Over, Barefoot World Atlas, Traktor DJ for iPhone and iPad and more are all currently free — Traktor DJ notably normally sells for $20. The apps have likely gone free to mark the upcoming fifth anniversary…