Sirvo LLC has Threes! (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store and for Android in the Amazon AppApp Store for $1.99 (regularly $2.99) for a limited time. The Android version through Amazon also included 60 Amazon coins.

Threes is tiny puzzle that grows on you. Explore the little game’s deep challenge and grow your mind beyond imagination. Optimized for iOS7 and human brains. Universal app for iPhone and iPads.