I start liquidy. Mix me and I become goopy. Mix me again, and I become solid. Sometimes after, I can be stringy, or square, but I cannot be mixed again.

A maze of stone with silence profound, many enter then turn around. Walls of rock both damp and cold, I harbor secrets to be untold. A silent mouth which does not speak, any who enter mustn't be weak.

I shine at night but have no flame, A borrowed glow, yet not the same. I dance on lakes, make shadows tall, Yet fade away when daylight calls.

Remove the first letter of something that's receding. There you will find me, so you'd better find your seating.

I'm a tool for creators, call me big C. But I make it so others can't use things for free. I keep things locked down with regulation tight. Not paste-left, but rather...