Fort Key

The Fort Key is an item found in Super Paper Mario. When Mario reaches Fort Francis, he discovers the front door is locked. A hidden Warp Pipe nearby leads to a simple block puzzle which rewards the player with a Fort Key when completed. The Fort Key can then be used to unlock the front door of Fort Francis.

Later on, two Fort Keys are found in Francis's private rooms, guarded by BigMeows. These are used to open the giant door to the room Tippi is being held captive in.