The Gauntlet

The Gauntlet is an area in the Challenge Node that Mario and Luigi can access in Mario & Luigi: Bowser's Inside Story. The Gauntlet is where the plumbers face X bosses, harder versions of bosses they have battled before. The X bosses that can be fought in the Gauntlet are:

*Player must beat all previous classes in order to unlock.
 * Class 1
 * Durmite X
 * Straw X
 * Biffidus X
 * Class 2
 * Kretin X
 * Class 3
 * Wisdurm X
 * Magic Rod X
 * Class 4
 * Bowser Memory MLX
 * Class 5
 * Junker X
 * Junker Can X
 * Class 6
 * Dark Star X
 * Dark Satellmite X
 * Class 7*
 * All of the previous classes plus Bowser X

Trivia

 * If the Bros. refuse to go into the Gauntlet, the Emoglobin at the door will mock the plumbers for being cowardly.
 * After beating the Dark Star in the Airway, the Emoglobin at the door will insist they train there for experience.
 * Scutlet, Chakron and the Dark Star Core are the only bosses that Mario and Luigi don't fight in the Gauntlet.
 * If the Bros. lose against Durmite X before receiving the Badges from Princess Lipid, the Emoglobin at the door will still mention their existence.