[Eddie was previously inhabiting a very comfortable cell in Arkham, at least as far as cells go; the beds are nice enough, and his roommate doesn't try to kill him, which is always a plus. There are the glass walls and vents connecting all of the cells, but that's neither here nor there.

The Riddler, currently donning his usual green and purple suit, takes a moment to look around before making a face] It seems Jerry has upped my medication once too many times. Then again, considering who I room with, there are worse hallucinations. [He begins to walk around, curious] However, if this happens to be more than a simple trick of the mind, then my situation becomes quite the puzzle. And as much as I enjoy them, it's much more fun when I'm the one with the answer.

[He kneels and raps his knuckles against the floor, almost as if he were expecting it to crack under his touch] Seems solid enough. Mirror, maybe? It would help explain how I'm surrounded by constellations. Whoever engineered this went through quite the trouble to make it look like the real thing. Except for a few details of course.

Now, riddle me this; what looks like space and contains a solid floor, breathable air, and no exit in sight?