The Indigo Underground is a level that appears in Paper Mario: Color Splash in the Blue Region. The path to this level is unlocked by finding the Blue Mini Paint Star from Port Prisma or Ruddy Road. The player must have the Plunger thing to open up the entrance, which has a Green Rescue Squad member stuck in it. All of the Green Rescue Squad Members are found here. There is a Yellow Mini Paint Star that leads to Daffodil Peak, and a Blue Mini Paint Star that leads to Bloo Bay Beach. The Indigo Underground is notable for introducing the player to the Shunned Guy, who rarely appears throughout the game. The Lemon Thing is also found here.
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