The Blue Shell (also known as "extra powerup") is a second tier power-up that has various different effects for different characters.
- Mario turns into Blue Shell Mario from New Super Mario Bros. This grants Mario a Shell Dash, allowing him to duck into the shell while running and slide along the ground like a kicked Koopa shell to take out enemies. He can still jump while sliding, but he has no control over its speed and direction unless he exits it by releasing the run button. It also gives him a Hammer Bros. Suit style duck to repel fireballs. While Shell Dashing, Mario can't create a point combo and will deflect off of most bosses.
- Luigi gains the Superball Flower which gives him the power to throw superballs. This powerup originated from the 1989 Game Boy game Super Mario Land and is similar to the Fire Flower but the superballs can bounce off walls and floors and can collect coins in places the player can't reach.
- Wario turns into Chargin' Chuck Wario. In this form, Wario gains the ability to charge indefinitely and charge right through weak enemies.
- Waluigi turns into Koopatrol Waluigi. This works similarly to Wario's version but is slightly weaker.
- Sonic and Tails will gain the Combine Ring. This will cause all dropped rings to combine into one single big ring upon getting hit.
- Link will gain the Golden Sword. This will replace his currently active sword. Can be charged up for a strong overhead swing.
- Roll will become Cleaner Roll. This will allow her to attack up close with her broom. Swinging her broom will also shoot a glob of water that can damage enemies.
- Samus will gain the Wave Beam. This beam moves in an odd wavy pattern and can shoot through walls.
- Legacy Link will turn into Bow Link, wearing the Goron Tunic from Ocarina of Time. In this form, Link can shoot arrows with his bow. The arrows can be aimed diagonally upwards or downwards. When an arrow hits a wall, it'll become a temporary platform Link can stand on.
Standard | Super Mushroom | Fire Flower | Raccoon Leaf | Hammer Bros. Suit | Tanooki Suit | Blue Shell | |
Crossover | Sci-Fi Suit | Mega Man Suit | Soldier Suit | |
Other | 1-Up Mushroom | 3-Up Moon | Poison Mushroom | Starman | Lil Reaper | Stomp Boots | Life Energy | |