Its DJMax on iOS

It plays a lot like Neowizs other rhythm game, Tap Sonic, but it uses the staple Fever system found in the original DJMax series on PC and PSP. (A Fever is a gameplay mechanic where your score bonus increases as the speed the notes come down at increases.)

As others have mentioned, while the game is fun, it suffers from pricing issues and the fact that jailbroken devices are barred from purchases. I suppose Neowiz is just too lazy to hire people capable of actually coding the store in a way thatll prevent IAP hacks from working. Instead, theyll just assume that everyone that modifies their iPods, iPhones, or iPads are pirates.

shnuu about DJMAX RAY by Neowiz, v1.0.7