Challenge Node

The Challenge Node is an area found inside Bowser's Body in Mario & Luigi: Bowser's Inside Story. This area is completely optional and does not need to be entered to complete the game. Here, Mario and Luigi can participate in several challenges:

• The Gauntlet-Here, the Bros. can fight tougher versions of bosses they have have fought before. They must be a specific level in order to fight a boss.
• Cholesteroad-Here, Mario and Luigi use the Special Attacks they have learned to fight the same enemies until the player messes up.

There is also a block that works the same way a Rally Block does here. If it is hit 99 times in a row, the player's Coins will automatically be doubled.