Rules:
*You can teleport into and out of it at will
*It has a couple of plug sockets and can connect to internet from the region you teleported in from
*You can take objects and people with you
*As already stated, it is (3m)^3 (3m*3m*3m). The walls are plain plaster with a light in the middle of the ceiling. The pocket dimension is topologically toroidal, so if there weren’t walls and a ceiling/floor (which you can actually destroy) you would loop if you went more than 3m in any direction. Gravity, then, is artificial and can be altered to anywhere from 0 to 2g from a dial on the wall.
Edit: additional specifications
*You can only teleport out to where you teleported in from.
*Time proceeds at the same rate inside the pocket dimension
*There is an eject button for those inside to get out if something happens to you
Can I only teleport back to where I teleported in from, or can I teleport out of the cube to anywhere I want?
Sorry, I should have specified. The former.
After spending a few minutes mulling it over, I’ve realized the only right move is for me to sell the cube to someone more clever than myself.
That’s arguably clever in itself. You recognise your weakness and adapt to turn a profit.
Don’t just sell it - timeshare that bitch!
How is the pocket dimension anchored? If I was on a plane and teleported to my pocket dimension, and then came back 5 minutes later, would I still be in the plane? Or would I be where the plane used to be 5 minutes ago?
You would still be on the plane.