Wind Stone

The Wind Stone is a Key Stone that appears in Sonic Adventure and its remake Sonic Adventure DX: Director's Cut. It is used to unlock the entrance to Windy Valley in the Mystic Ruins Adventure Field.

Description
The Wind Stone is a figure slightly smaller than Sonic the Hedgehog's full height. It has a grey square rock stand with an ellipsoid green crystal fixed vertically on green ring on top of it. Inside the green crystal, the Wind Stone has a symbol resembling a vortex.

The Wind Stone appear in Sonic, Tails and E-102 Gamma's storyline, where it can be found in front of the front door to Tails' Workshop in the Mystic Ruins Adventure Field. The Wind Stone is to be taken by the player to the cave with wind blowing through, on the left of the open area in front of the train station in the Mystic Ruins Adventure Field. There, it must be put in a pedestal with a square green crystal, which will then open the entrance to Windy Valley.