Enough people missed out on New Super Mario Bros. U on the Wii U that Nintendo has brought the title to the Nintendo Switch with a number of improvements and adjustments to make the game even better and more smooth to play. Though the game is very much a traditional 2D Mario platformer, it has a lot of exciting secrets and levels to explore that are sure to keep Mario fans interested for some time. Plus, you can play with up to three friends in any of the game's levels! If you’re discovering New Super Mario Bros. U Deluxe for the first time, you might not know about the many, many secrets hidden in this platformer throwback to Mario’s glory days on the NES and SNES. The game is packed with secret features, and we’re going to try listing them all for you. Most of these hidden features are impossible to discover on your own, so don’t feel too bad if you decide to buy this book.