Kowloon was a sizable locale in the videogame Shenmue 2. I don't know how true to life that section was, but it was honestly one of the most depressing environments I've ever encountered in a videogame. It was racing up and down dozens of identical floors featuring nothing but dank, claustrophobic apartments.
Call of Duty has a pretty lame Walled City level. I wonder if there's surviving blue prints for the apartment blocks and enough archival information to faithfully recreate it virtually one day.
I will never forget that part of Shenmue 2. It blew my 14 yo mind at the time when I found out that not only Kowloon city was real but it was also 10x more depressing in real life.