Mystery Circle

The Mystery Circles are a type of gimmick that appears in Sonic and the Black Knight. They are a variant of Switches that, when touched, makes different objects appear.

Description
The Mystery Circles have two different appearances. When inactive, they glow red and resemble a circle with medieval lines which is surrounded by an outer circle with four fleur-de-lis on it that point inward. When active, the Mystery Circles glow blue, their inner circle grows larger and is surrounded by an additional circle, and the fleur-de-lis on the outer circle point outward.

In gameplay, Mystery Circles appear during the Missions and can be located on either the ground or the walls. When activating a Mystery Circle, it will cause additional objects to appear on the player's path, such as different types of fairies, Rings or Treasure Chests. While some of the objects revealed by the Mystery Circles only serve as bonus items, others are necessary for the player to complete the Mission. To activate a Mystery Circle, the playable character simply has to touch it.