Secret Door

The Secret Door is a gimmick that appears in Shadow the Hedgehog. It is an unlockable door found in the Stages which hold objects that can be used to the player's advantage.

Description
The Secret Door is a large stone door sealed with five padlocks across it. They appear in every Stage in Shadow the Hedgehog.

The Secret Door holds behind their entrance contents and features that can provide the player with extra help to complete the Stage faster. What they hold however, differs between Stages. Some have a hidden route behind them with a flying vehicle that can be used for a shortcut, some hold ground-based vehicles and weapons to help fight enemies and others contain Warp Holes.

In gameplay, the Secret Door in a Stage cannot be opened until the player collects all five Secret Keys in the said Stage. After obtaining them and going to the Secret Door, the locks on the Secret Door will break off and the doors will open.