OK, fine: things aren't under control. What matters now is that you are the only one near this thing and so the only one who can stop it. The anti-matter has completely leaked out and...well..it will create a blackhole that will engulf the whole planet. Sounds lovely, doesn't it?
What you need to do is find two cubes which can power each magnet. The blackhole will form relatively quickly, that is not something we can stop. However, the blackhole needs the magnets to exist while it creates its event horizon and stabilises its singularity. Once they are powered, I should be able to increase the magnet strength, which should unstabilise the event horizon and force the singularity to dissipate.
Good luck!
Information:
(Previous rules from the other testing partly apply, though some mechanics such as gravity do not appear in this facility)
The mirror cube and the reality cube can have slight differences, for example, portals are not in the same place.
The reality cube can have paths that appear invisible in the mirror cube, so both, essentially, become mirror cubes.