Secret Key

The Secret Key is an item that appears in Shadow the Hedgehog. It is a golden key that can open a secret doors inside every Stage in the game.

Description
The Secret Key is very similar to the Special Key from Sonic Heroes, except it only has one tooth and dark yellow frames. In gameplay, the Secret Keys allow the player to enter a Secret Door, which is found in every Stage in the game.

Every Stage has five Special Keys scattered throughout it which are all required to be collected to open the Stage's Secret Door. Touching a Special Key will make the player pick it up and then automatically saved as Game Data, ensuring the player does not have recollect them every time when playing a Stage. When the player brings all five Special Keys to the Secret Door, the five locks on it will break apart one after another and open the door.