I'm not sure if you understand the video game industry, but literally every popular game is a clone of something that came before it.
EDIT: This is obviously not true for some X where X is a base case of a popular game genre (e.g. Portal, Donkey Kong, Wolfenstein 3d), but it's generally true. Mario 64 is just a 3d platformer at some level, which is why it's so easy to clone.
EDIT: This is obviously not true for some X where X is a base case of a popular game genre (e.g. Portal, Donkey Kong, Wolfenstein 3d), but it's generally true. Mario 64 is just a 3d platformer at some level, which is why it's so easy to clone.