Press Forward [C] Silver (not FC)
This is insanely difficult, how is this not hist and a 3-star????
Some other people did the not FC silver with a hultra but I found an easier way. You have to:
1. perform all the GM+++ insane gameplay and get to sumber
2. stand on that exact pixel
3. do an instant super; the jump should be pressed during the dash's freeze frames so you basically press dash and jump almost simultaneously; don't hold left
4. after entering the bubble, press right, up and grab
5. do all of the GM+4 gameplay required by the map to get to the heart.
It's really easy just the pixel is precise because otherwise you'll get a bad cycle and die.