Sonic the Hedgehog 16-bit

Sonic the Hedgehog
(16-bit)

Codes (Sega Genesis)

Level select: On the title screen press up, down, left, right (you'll hear the ring sound if done correctly). Hold A and press start and you'll be taken to the stage select screen.

Debug mode: Enter the stage select code and then select any level to start the game. Press the reset button on the console to return to the title screen. This time press up, C, down, C, left, C, right, C (the ring sound will play again). Hold A and press start to enter the stage select screen. This time select your stage with A and continue to hold A until the level appears to begin in debu mode.

Debug controls:
B - Enters/Exits debug state
A - Cycle through placeable objects
C - Places object

Codes (Sonic Origins)

Level select: On the title screen, once Sonic has appeared in the emblem press up, down, left, right (you'll hear the ring sound). Starting the game will take you immediately into the stage select menu.

Debu mode: Once in stage select go down to the sound test section and play these sounds in this order: 01, 09, 09, 01, 00, 06, 02, 03 (ring sound again if done correctly).

Debug controls: (listing Playstation by default, but mapping is the same across all consoles)
X - Enters/Exits debug state
Circle - Cycle through placeable objects
Triangle - Places object

Start with all Chaos Emeralds: Return to stage select and enter the following sounds in the sound test: 04, 01, 02, 06 (the theme that plays when you obtain a Chaos Emerald will play). Note that if you toggle the amount of Chaos Emeralds to 7 it will now be possible to transform into Super Sonic in Sonic 1.