ToME: the Tales of Maj'Eyal

Sandworm Lair can be frustrating. I don't have much of a problem myself, I learned to navigate it (and avoid teleport). But the place would generate much less rage if it was more transparent about what's going to collapse.

I have a simple suggestion: Tiles which will collapse next turn should have distinct appearance.

If being focused and constantly cautious is part of the intended difficulty, then make "collapsing walls" only visible on lower difficulty levels, such as Easy.

I like it. Actually it might be a good thing to use different tiles for solid and collapsible sand, since they already show differently on the minimap anyway.