OSR: One Page Dungeon: The Roving Wheel

I'm trying to write a few one-page dungeons. It's harder than it looks... and it looks hard. Every time I try, I appreciate Michael Prescott's work (and the fine entrants to the One Page Dungeon Contest) even more.

Here's a fun adventure for a slightly gonzo campaign. There's a huge iron wheel rolling across the landscape. Get inside and divert the wheel before it crushes a city. 

The Roving Wheel

The dungeon's a real page-turner.
I'll get my coat.

It's released under CC-BY-NC, so feel free to hack, edit, remix, translate, or whatever else you'd like. Here's a blank wheel image if you don't want to make your own.