Blue Key (Paper Mario: The Thousand-Year Door)

The Blue Key is a key found in Paper Mario: The Thousand-Year Door. It is located inside the Great Tree, in the room after the small Jabbi army. The key opens the cage where ninety Punies (including Petuni, Punio's sister) are imprisoned, increasing Mario's Puni army from eleven to one-hundred and one.

In the Japanese version when unlocking the blue cage, the game checks for and removes the Strange Sack from the player's inventory if the player has it (which will permanently prevent it from being obtained again as there is only one in the game). This does not happen in the international versions.

Names in other languages
Blauer Schlüssel it:Chiave blu (Paper Mario: Il Portale Millenario)