If ever had to recommend a Rhythm game to try out then it would definitely have to be DJMAX Technika Q for Kakao. The game offers various songs from the DJMAX series and most of them are really good. Unlocking new songs might take awhile, especially if you're not going to spend money on the music packages in the cash shop. There are a couple free songs that you can unlock normally, but the rest of the songs can only be unlocked with cash points. Some daily quests will reward you with cash points.