Sonic the Hedgehog (1991) codes: level select and debug mode
Level select, debug mode and other codes for the original Mega Drive/Genesis Sonic the Hedgehog.
Original 1991 16-bit Mega Drive/Genesis game. The Master System/Game Gear game is separate; later remaster moves, extra characters and Super transformations are outside this hub.
Level select
On the title screen, press Up, Down, Left, Right. A ring sound confirms it. Hold A and press Start to open the level select.
Debug mode
On the title screen, press Up, C, Down, C, Left, C, Right, C. A ring sound confirms it. Hold A and press Start. In a level, press B to turn into an object, A to change the object and C to place it. Press B again to return to Sonic.
Level select and debug together
Enter both codes on the title screen, then hold A and press Start. Choose a zone from the level select and debug mode will be active.
Version note
These inputs are for the western Mega Drive/Genesis release. The Japanese release and later ports use different inputs.
More Sonic the Hedgehog quick answers
Where to find the Chaos Emeralds in Sonic the Hedgehog (1991)How to unlock the good ending in Sonic the Hedgehog (1991)Placing objects in debug mode can trap Sonic or break a level. Save experiments for a level you can restart.
Picture details
Game artwork belongs to its respective rights holders.