If I get a C on a Difficulty 20 Song in Robeats, the Video Ends

This is one of the hardest challenges i had to do.

Game:
If I get a C on a Difficulty 20 Song in Robeats, the Video Ends
If I get a C on a Difficulty 20 Song in Robeats, the Video Ends
If I get a C on a Difficulty 20 Song in Robeats, the Video Ends

Video