I wish I could give this game a higher rating. I don't typically game on mobile, only do if I'm extremely bored, and when I do, I love a reaction based game like this. Excellent music with some challenging aspects but not too challenging that it feels obnoxious all around great design. The reason for my low rating is that you can never truly practice a difficult song without being bombarded by constant ads. If there was a lifetime ad-less option I would legitimately pay for it, sadly though...