Full single player Quake II map. Also supports DM play.
Nothing even comes close.
Yes, all of them. Compiling utilities released by id software. Unfortunately, getting into this prison will be quite a challenge, as it's guarded also by several laser grids which must be shut off before attempting to get inside. You take on the responsibility to wipe out this secret penitentiary, relieve the imprisoned inhabitants from their pain, and also find a way to shut the place down. You are NOT allowed to commercially exploit this level, i.e. put it on a CD or any other electronic medium that is sold for money without my explicit permission.