Skeleton Dome is the seventh World of Sonic and the Secret Rings. It is an area of desiccated boneyards of what were once King Solomon's, a legendary skeleton king, mines. However, this world has "snow" at the beginning instead of being placed in the chambers. This world also features skeleton warriors, animal bones and two-sided axes.
The level starts somewhere outside the dome where Shahra mistakes falling bone dust for snow. After a while you enter cavern with bone walkways leading to a palace. You then enter an arena, which also appears in acts as a circuit. At the end of Act 1, you enter the throne room where King Solomon sits. There will even be a 3D model of his head, though it is difficult to see.
In one of the "Rampage!" missions, Sonic says "I guess that's why they call it the Skeleton Dome", after Shahra calls the arena huge.
Several areas in the level have a skull with glowing red eyes that transports Sonic to another area.
In Act 1, there is a secret path to an area where you run along the backbone of a serpent. This path lets you get a Gold medal due to saving time.