When Benjamin Carter is thrown into an Aperture prison for a murder he didn't commit, he is mysteriously released from his cell three days later. Who is that wants him released? And why? "MillenniuM" is set in world that thinks it's coming to an end with the turn of the year 2000 - Benjamin Carter may find out why.
A somewhat alien-looking device in the Mirror Maze.
That really looks out of place. Also I recommend wrathofmobius's Wall Tile Randomizer, very helpful, you can download it on TWP.