These games based upon Terry Pratchett's Discworld Universe.
Ankh-Morpork is the name of fictional city-state which is prominently featured in the books. Guards! Guards! is the 8th Discworld novel and the first one to feature the Ankh-Morpork City Watch. Thud is a board game inspired by the Discworld novels including the 34th Discworld novel which was also named Thud!.