Have you ever done a crystal/ice palace before Veeky Forums? What are some good puzzles or traps for one such palace...

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Invisible/clear walls. Invisible mazes are always fun.

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One narrow room has what looks like rippling walls. Upon closer examination, it becomes apparent that the walls are actually microfine lines of thin but strong crystal. If you fall into it or push anything against it with any sort of force, it's cut to paper thin sheets.

If the ice is thin enough to be invisible, the maze isn't going to be a maze for long once the PCs get in there.

Magic super-glacier ice, man. Won't break, won't melt. Or if it melts, water just keeps coming off it because it's so supernaturally dense that you will flood the passageway before getting through a single wall.

Make the Ice Palace inhabited by someone that really, really doesn't want the PCs ruining their house; perhaps it belongs to a king that needs it cleared of evil spirits?

Don't forget to have things frozen in ice. Things you want to get out, and things you don't want to get out. Maybe one of each in the same block.

You better have a really good reason as to why someone built it like that. Otherwise you come across as one of those fuckwit GMs who won't tolerate puzzles being solved by anything but the one solution you intended.

Now that is a good reason for PCs trying to preserve the maze, if they got warned about the maze beforehand.

If not, expect them to learn about the maze after they put a big hole through one of its walls.

>You better have a really good reason as to why someone built it like that

Because what kind of evil mage builds an ice-glass maze that you can just trivially cut your way through? If it exists at all in a dungeon context, its designer must have solved the "just smash it" problem.
The maze is intended to slow or dissuade visitors, it wouldn't be effective if you could just break it down with your bare hands.

The Tomb of Horrors didn't solve that issue.

Yeah, but it wasn't made of paper-thin ice that was invisible. It took a massive engineering effort to dig it out. It's probably not worth defending against that level of attack, but defending against "adventurers can push through the maze's wall with one hand?" That's worth the effort of shoring it up, at least a little.

mirrors and cursed metals.

bump

A hall of mirrors that creates copies, so the villain can stand there and say:

> "But which of us is the real one, and which is only the illusion?"

I created an entire country of ice

but what did you do in it?

Nothing, the whole place is a dump with a small civilization what so ever