Red Key

The Red Key is an item found in the Paper Mario series.

In the original Paper Mario, the Red Key unlocks the red door in the Crystal Palace. The Red Key is to the south of the entrance room. Mario must first go to the north side and break a wodden floor with a Tornado Jump. After doing this, where a red cross appears on the floor in the south side will become a hole. The Red Key is in a chest at the end of the road down this hole. The in-game description reads, "A big red key."

In Paper Mario: The Thousand-Year Door, another Red Key unlocks the cage the Puni Elder was imprisoned in during Lord Crump's invasion of the Great Tree. It is held by an X-Naut in the storage room just west of the prison. After Mario enters the storage room, the X-Naut becomes conscious, mistakes Mario for hitting him, and gets in battle. Defeated, the X-Naut drops this key.