Codex Gamicus

3D Sonic the Hedgehog, unlike most downloadable re-releases of Sonic the Hedgehog, is not emulated. Instead, the code was restructured to take advantage of the Nintendo 3DS' stereoscopic 3D graphics and comes with additional enhancements, such as the option to use the Spin Dash move (originally introduced in Sonic the Hedgehog 2), a CRT-style filter, and the option to use a level select to start from any level.