Welcome back! It has been a while but we at the AMTF (Anti-Matter Testing Facility), a partner organisation to BSTF (BeamNG Science Testing Facility). Those at BTSF have handed you over to us to help with testing some new materials.
The main material we have been testing is Anti-Matter, surprise surprise. We know that it explode astronomically when in contact with other matter, so don't touch it...seriously, we have enough Anti-Matter to annihilate the galaxy. Don't worry about!
There's only one main mechanic which will be introduced into this tutorial. Each cube has a glass, vacuum pressured wall, such that the Anti-Matter contained in it does not react with normal matter. It seems to create a distorted image in the mirror, which reveals objects that exist in reality which cannot be seen. You'll pick it up as you go along, don't worry. Finally, the glass which reflects reality seems to fabricate itself upon a mirror plane...
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.