Well, if you hadn't noticed, he's going in order of block ID (more or less - I think there are some parts that are out of order), so those are the ID's that don't have corresponding blocks. If you mean the "go" part, I think that's something regarding Sporcle.
Inb4 95% of the space is left unused. Walk along the bottom of the dungeon. Linear path, great area.
I'm alright with space not being used. Having a large open area for aesthetics is alright, as long as it's clear where to go so you don't end up exploring the worthless parts. Pulling this off is pretty tough, however, so sometimes it's best to keep size low.
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There ain't much left of the world these days. The gods have forsaken us, there's no denying that. But still you press on. For what? A chance to sift through the ashes one last time? The hope to one day be called a hero? Whatever your reason, you've got a lot of work to do. The corruption won't leave without a fight, so you better get started.