Giant Rings, also known as Special Rings (スペシャルリング Supesharu Ringu?), Warp Rings, Dimension Rings and Factory Rings, are larger variants of the Rings in the Sonic the Hedgehog series which first appeared in Sonic the Hedgehog (1991). These rings serve usually as the means of entering the Special Stages or other locations when certain requirements are meant, but have also been used for other purposes.