The arcade room

It's a building of indeterminate size, because if you try to reach the end, you'll realize that it's just not there, and that it's as if the building has no end.
In any case, you can't go further than 100 meters from the Main Corridor because there are force fields further away; this is done to keep you away from what is further away.
The Main Corridor leads to the arcade, where there are absolutely all the games that are suitable for playing on a machine (even if they were not made for machines, but for computers or phones, but if it is theoretically possible to play them on machines). Also from the Main Corridor you can get to a small movie hall, where there are all the movies from 1970s to 2010s.
There is also a bowling room, a billiards room, and a room with mini racing cars. The Main Corridor has a bar and cafe, although bars are in all the rooms.
There's lots of neon, 80s and 90s posters, and lots of other 80s interior.
If you walk left or right along the Main Corridor 100 meters, you will encounter a transparent force field through which you can see the continuation of the corridor, but you can't go through the field.
There is also an exit door in the Main Corridor, and you can always return to your home dimension through it.
There are no people here, but you may notice strange, often large shadows or silhouettes behind the force fields, but you don't have time to fully see them. In any case, they are not dangerous, as the force fields will prevent them from entering the Main Corridor, and they will not show themselves to you.

You can just have fun here. You can always return home to your homeworld through the door in the Main Corridor, though you can't enter this dimension again after that.