I haven't drawn more than diagrams in twenty years before this.
Nine hours solid working on this. I read the description in the game, and something in the back of my mind said yes, do that, and I didn't even question the thought but just went and fetched my tablet and pens, and set to work, and did not stop. I only even managed to pause once, and that only lasted until I moved ahead in the game a little and hit the "tunnel" loop. Five seconds in, I knew I wasn't going to be able to stop again, not even for a minute, until the work was done.
But then that's entirely apropos, isn't it?