Oh, and a thought came into my mind:
Photongenic [h]. A level 10 that can be hard cleared. How is it done:
There this part before the middle that has a continuous key press (bass note) plus a three-note scale. All you have to do (is if you are using nonrandom) to just use one finger of one hand for the bass key which is 1 and you other hand for the three note scale.
If you know how to isolate your hands, then you can hard clear this shit