A portal 2 mod set on the moon (Or more specifically inside the moon) Aperture hollowed out a lot of the moon during the space-race and made testing facilities in the hollowed out rock which was later re-purposed for mining moonrock for gel. You are awoken from slumber in a relaxation pod years in to the future when the underground facilities are crumbling and close to collapse. Find a way to the surface and back to earth..
Test 1
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I really like the grand scale here, this space looks absolutely massive, making really good use of what the engine has to offer.