Super Mario: World Tour is a video game that revolves around Mario working for a secret agency, and going around the world, tracking down and killing zombies. The game is known for being much darker than the other Mario games. Mario holds a gun throughout the entire game, allowing the player to shoot civilians as well as zombies. This led to an M rating (18+ outside of the US). The violence startled the parents, whose children played the game. The game actually made more money than the other Mario games.