What I am trying to get to is that many video games have a sewers level. To my understanding, these aren't as realistic as we'd like to think (too big or sewerage wouldn't exist yet in the settings timeframe; you name it). I know of the idea of cesspits, but modern cesspits don't tend to be in cities, and are well regulated by laws.
If you were to think of a medieval (anything from 12th century to 15th century) city, with quite a high population; how did the major cities handle waste disposal? Did they use a cesspit? Because if so, I am already filled with a bunch of questions:
Basically, I can't picture what waste disposal and going to the toilet is like in those times... And I dislike the idea of giant tunnels called sewers where you can walk among the turds. Correct me if I am wrong, but that seems like a game design to me rather than an actual historical practice.
(ps. I do understand that they might not have entirely known what we'd consider best practices. There is a reason why we've had the Black Death and the like: people wouldn't have known what we know about hygiene.)