Thank you. I didn't know about the movable objects. But the problem still isn't solved. Let me explain in more detail. I need the hero to stand in a region when approaching a wall in the Dungeon, and the following things should happen: an effect (light) appears on the wall, the region that the hero couldn't walk on is removed, and a secret passage through the wall is opened. How can I script all of this?
Regarding underground walls. You can walk through them if you place a bridge from the Grass folder and bury it using the z-coordinate. It won't be visible, and it will be like an invisible passage.