3D Sonic the Hedgehog (3DS) Cheats & Tips
Cheats, codes, tips, hacks, how to's, and walkthroughs
Cheat codes: Level Select
At the title screen, press Up, Down, Left, Right, Y, X
Cheat codes: Debug Mode
At the title screen, press C-Up,C-Down, C-Left, Right. When you hear a ringing, hold A and tap start until you see Sonic.