Sonic and Knuckles & Sonic 2

Sonic and Knuckles & Sonic 2

Debug Mode when Linked to Sonic 2

Go to the level select screen and play tunes 1,9,9,4,1,0,1,8 (the date when the game was made.) Choose any level, then hold A and press Start to activate Debug mode. To use it, see the instructions in Sonic the Hedgehog.

Level Select when Linked to Sonic 2

At the title screen, press Up, Up, Up, Down, Down, Down, Left, Right, Left, Right. You should hear a ring. Next, press A + Start to enter the Stage Select screen. This code will remain in effect until you turn off the Genesis.

Play at Night when Linked to Sonic 2

For Sonic 2: Activate level select (19, 65, 9, 17) and hold C and press Start.

Easy Emeralds when Linked to Sonic 2

Enter the LEVEL SELECT code shown below. Go to "special stage" and get an emerald. You will go to Emerald Hill Zone. Pause the game, and press A. Enter the level select again and return to the special stage. Repeat this process until you have all the emeralds.