Castle Key

The Castle Key is an object that appears in Sonic Heroes. They are usual keys with the ability to open the doors inside Mystic Mansion. Team Chaotix's objective in Hang Castle is to find these keys.

Description
The Castle Keys resemble mostly keys for lever-type locks. They have a slightly flattered, green hexagon-shaped bow with what appears to be a half-closed eye in the middle. They also possess a short shaft and two teeth for a head. They are usually found afloat on the ground.

The Castle Keys are found exclusively in Team Chaotix's version of Mystic Mansion where ten of them can be found hidden in the Stage. The objective for the player in this Stage is to collect all ten Castle Keys.

When touching a Castle Key, they will give off a small "ping" and then slowly fade away. Sometimes, they are found inside cages that the player must unlock and other times they are floating in open areas.