Legend of Grimrock - Building the Dungeon Part 2

The Grimrock blog has a second article about Building the Dungeon, further explaining their level-building process:

It might be shocking news to you but we don’t actually have a level editor at all. All our levels are laid out in text editor because that was the fastest way to get started. The initial plan was to first do a few test levels with text files and then code a proper graphical level editor. Well time passed and we actually learned to like the text based system a lot. It actually has some really nice properties: first, because we are using a full blown programming language (Lua) we can use all kinds of nice programming techniques like create functions (i.e. pieces of script code) that help in repetitive tasks or even automate some aspect of level creation like place items procedurally in the level. We can also script all kinds of wacky features into level files without having to wait for our overworked programmer (yea, that would be me!) to add new features to the level editor. Another benefit is that we can easily search for items in the levels simply by doing Find in Files in text editor.