It's so challenging! Watch my gameplay!
I know you might get bored watching this, so at least watch 1 level for boss levels 2-13.
For Levels 2-1 through 2-12, I forgot to record them. I also couldn't replay level 2-12 (rank A). It happened because I left the game temporarily. I replayed the level to get rank S and yes it took a long time to get it "perfect".
I think you should try it :D
When playing, your beat should be just right, your mind focused, and your fingers should be agile. Prediction is also another variable. Btw, this is similar to the Avici game.
I wish it was available on TapTap, I want to tag the game here and rate it.