When I was young I used to make a lot of levels for Tomb Raider (3? 4?) because I found the process of making sacred-but-spooky feeling places very enchanting. I had no one to share them with, so it was more like just making folk art for myself and my brother. This feeling was not surpassed until Minecraft came out (and then that was not surpassed until I bought land).
The levels are fundamentally comprised of square blocks that you push up from the ground, and maybe tilt one of the four sides to make shapes. To make caves and rooms, there is a second set of blocks that you pull down from the ceiling!
To get an idea of what this feels like, see this particular tutorial video of theirs: https://tombengine.com/docs/extended-geometry-update-1-7/
Took me a couple of seconds to realize that “land” was not a video game.
You goto patch the Excavator 1.0 engine to be able to alter "land" its kind of finicky
The ultimate sandbox.
The cube engine also works in this manner. A block engine where you can independently push the corners.
http://cubeengine.com/index.php