It's in combat text
1. You find a row of blackberry bushes so thick that you can't even see what's on the other side. It's probably just more blackberries, but just in case, you mark the location on your black map.
2. You find a cozy black cottage nestled deep in the forest. From the smoke and anvil noises, you conclude that it's probably either a blacksmith's cottage or an anvil-testing facility with liberal workplace smoking rules. Assuming it's the former, you mark its location on your black map.
3. In a secluded valley surrounded by towering black trees, you spot a mineshaft sunk deep into the black depths of the earth. You mark its location on your black map.
4. In a copse that would be idyllic if it weren't so dark, you find a church that would be picturesque if it wasn't so sinister. You mark its location on your black map, in case you ever want to go to a scary church for some reason. Like if Halloween falls on a Sunday, maybe.
5. At long last, you discover the trail leading to the Black Market. Frustrated that it took so long, you wonder why they didn't just put up a sign. But then you remember what a black market is, and realize why that would have been a bad idea.
Edit - The 24 points to progress thing on the wiki seemed to be being disproved whilst I implemented this one, as things didn't seem to exactly fit. I suspect Jick used a slightly random increment, as he was doing in Twitch streams around the same time, so I used the things we could be sure of.