The full version of Duet Game by Melbourne, Australia-based Kumobius has just been slashed to zero bucks as Apple's latest free app of week. As you know, each Thursday App Store editors get to cherry-pick an app or a game that goes temporarily free for a week.
This twitch reflex title was on the App Store's Best of 2013 list and shouldn't be missed. Easy to play, hard to master, Duet elevates the act of dodging falling blocks into something “captivating, beautiful, even profound.”