▲
2
▼
The game's reveal trailer on September 13, 2018 shows Mario being played in the levels "Waddlewing Warning!" and "Larry's Trigger Happy Castle". This is not doable in the final game as those are levels from New Super Luigi U, where Mario is not a playable character.
Reveal Trailer for New Super Mario Bros. U Deluxe:
https://www.youtube.com/watch?v=6wTFy-pJFMI?t=37
Evidence of the levels being from New Super Luigi U:
https://www.youtube.com/watch?v=VuT8JjMnVhM
https://www.youtube.com/watch?v=DNcegeMfLTc
https://www.youtube.com/watch?v=6wTFy-pJFMI?t=37
Evidence of the levels being from New Super Luigi U:
https://www.youtube.com/watch?v=VuT8JjMnVhM
https://www.youtube.com/watch?v=DNcegeMfLTc
▲
1
▼
By playing as Peachette in the final level of Peach's Castle, the real Peach will act confused before the fight plays as normal.
Related Games
New Super Mario Bros.
New Super Mario Bros. Mii
New Super Mario Bros. U
New Super Mario Bros. 2
New Super Mario Bros. Wii
New Super Luigi U
Poochy & Yoshi's Woolly World
Super Mario Bros. 3
Super Mario Kart
Yoshi's Safari
Mario Bros.
Luigi's Mansion: Dark Moon
Captain Rainbow
Super Mario All-Stars + Super Mario World
Mario vs. Donkey Kong: Tipping Stars
Mario Kart: Double Dash!!
Luigi's Mansion
Mario Tennis: Ultra Smash
Golf
Nintendo Land
Super Smash Bros. Melee
Super Paper Mario
Mario Bros. Classic Serie
Mario Superstar Baseball
Mario Power Tennis
Mario & Sonic at the Sochi 2014 Olympic Winter Games
Super Mario World: Super Mario Advance 2
Mario Party
Mario & Sonic at the Olympic Games
Mario Golf: World Tour
Super Mario RPG 2
Game & Watch Gallery 4
Super Mario Sunshine
Mario & Luigi: Dream Team
Super Smash Bros. Brawl
Yoshi's Woolly World
Mario Golf
Super Mario Maker
Mario Kart 7
Dr. Mario 64
Mario Tennis Open
Mario Strikers Charged
Super Mario Land
Paper Mario: The Origami King
Donkey Kong: Original Edition
Super Mario RPG
Super Smash Bros. Ultimate
Mario Party 10
Super Smash Bros.
Donkey Kong