Precioustone

The Dreamcast game Sonic Shuffle is set in a dream world known as Maginary World. In this world lays a mysterious stone known as the Precioustone, which keeps the Maginary World under control while residing in the Temple of Light. The Precioustone is shattered by Void, which causes Maginary World to fall into disaster. After being brought to the world by Lumina Flowlight, Sonic and friends then set out on a quest to find all the pieces of the Precioustone and repair it. Eggman also follows them as he wants to get his hands on the stone, but eventually the heroes repair the stone and leave Maginary World.