In addition to featuring new power-ups, Wonder builds off the gameplay and multiplayer of previous 2D games, with some 3D Mario DNA brought into the game in a myriad of ways such as numerous openly-traversable world maps. It's up to Mario and company to put a stop to Bowser yet again, traveling through the Flower Kingdom and adapting to its wondrous environments. Their friendly visit is cut short once Bowser arrives and takes a hold of the Wonder Flower, using it to merge himself and Prince Florian's castle to become a Mechanical Abomination, causing chaos across the land and trapping all of the kingdom's Poplin citizens in their own homes. Mario and friends are invited by Prince Florian to visit the Flower Kingdom, a not-so distant kingdom beyond the Mushroom Kingdom.
U, almost eleven years prior, and the first 2D entry to utilize a new visual style since the inception of the New sub-series.
It is the first new traditional full-fledged 2D mainline installment since New Super Mario Bros. Wonder is a 2D Platform Game in the Super Mario Bros.