aaaaaaaaaaaaaaaaaaaaaaaaaaagh why I'm so tired of design challenges in all the camps I'm in (lol, I can do this one) Anyway, Mirror reflected a bunch of rainbows from the rainbow emoji used in Pixel ?'s name. They now surround Black Hole, and he's trapped, considering that THESE rainbows can't be sucked in by black holes. Tried it with a few black holes in the past and it worked.
Credit to @W0ttThaH3ck