Sonic CB(Crystal Ball) is a fan-game experiment which blends 2D and 3D elements. The visuals are created by taking a large 3D sphere and wrapping it around the player. Other visual elements include a flexible screen which can zoom, stretch, and pan to the left or right. Objects on the 2D plane also have the ability to move along the Z-axis.
This alpha version of Sonic CB allows gameplay for the first act of 4 different zones: Crystaline Kingdom, Garland Grove, Mystic Oasis, and Polaroptic Powerplant. Playable characters include Sonic, Tails, Knuckles, Epsio, Mighty, and Vector. Modes of gameplay are single-player, 2-Player split-screen.