Super Mario 3D World is a 2013 platform video game developed and published by Nintendo for the Wii U. It is the sixth original 3D platform game in the Super Mario series and is the sequel to the 2011 Nintendo 3DS game Super Mario 3D Land. The game follows Mario and friends attempting to rescue fairy-like creatures called Sprixies from Bowser, who invades the realm known as the Sprixie Kingdom. The gameplay is similar to previous installments of the series, with players passing through individual levels to reach Bowser. The game also introduces a power-up called the Super Bell, which turns the character being played into a cat, enabling them to climb walls and use a scratch attack, as well as a character selector.