Key Master

Key Masters are enemies in Spirit Tracks. They appear in some dungeons whenever Link tries to carry the Boss Key to the boss door. Link must take a certain path or the Key Master will appear from the floor and chase Link. If the Key Master retrieves the key from Link, they disappear into the floor and the key will reappear at its original location, forcing the player to try again.

They behave and look similar to the Floormasters from Ocarina of Time and Wind Waker, and to Zant's Hands from Twilight Princess. They appear from the floor through black portals, and have eyes on their palms. They "walk" on their fingers.

Trivia
The Key Masters movements are similar to those of Master Hand and Crazy Hand from Super Smash Bros. Brawl.