Issues with this:
- we do not track whether Big Brother has been rescued. That would be easily done by noticing that choice #299 option #2 has been taken. After the fact, we could deduce it by the presence of a bubblin' stone in inventory or a successful visit to Big Brother.
- we do not track whether you have bought a damp old boot yet. Nor, for that matter, do we track if you have bought any of the "once per ascension" items from Big Brother - especially the maps, which don't actually go into inventory.
This Bug Report speaks of that.
- even if you have freed Big Brother and have not yet disposed of the damp old boot - either because you didn't buy it or because you have not selected a reward for it - trading it for the wallet is not the only option. If you don't have a fishy pipe, you might want that, instead.
I am planning on working on Big Brother a bit soon, so I will take care of the first two issues, at least.