-Expansive, detailed open world map... At some point, you will most definitely get lost.
-Cryptic puzzles that require brain power to solve....
-Loads of politically incorrect black humor !
-Cat cuddling. Lot's of cats that you must track down and cuddle.
-Complex inventory system of weapons and armor, many of which interacts with each other for better or worse.
-A zombie factory.. Just in case you've ever wondered how zombies were manufactured.
-And most importantly, lots and lots of violence.