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 Sonic & Knuckles

3D Bonus Full Game:

Surely this is one of the best cheats ever. With it, you'll get a full secret game, where you need to get through millions of 3D bonus stages (no kidding!). To play this, just lock-on Sonic 1 to Sonic & Knuckles (visit SSRG
Lock-On Technology Hacking Guide to see how to do this with an emulator). It will say "No Way? No Way! No Way! No Way!". Press A+B+C and you'll get the game. For each stage you'll get a password. Visit SSRG section Bonus Codes for hundreds of them. Tip: If you get all the rings, you'll advance 10 levels.
With most of the other games locked on, you can play a single level by pressing A+B+C. If you get all the rings, you'll get a password for recreate that level in Sonic 1.

 

Stage Select & Sound Test:

Start the game and grab to the first pull-up machine, then press Left, Left, Left, Right, Right, Right, Up, Up, Up. If you've done this correctly, you'll hear a ring. Now you can pause the game and press A to reset. In the Sonic or Knuckles menu, press A[Start] to enter the Stage Select.
You'll see the stages from Sonic 3, but if you select any, you'll go to Mushroom Hill. The two Special Stage acts will get you into the next Special Stage you need (you can get an emerald, reset, enter the Stage Select again, get the next, reset, and so). Notice the Lava Reef act 3 and act 4 present in the menu. Lava Reef act 3 is actually Lava Reef act 2, boss area. Act 4 is Hidden Palace. Sky Sanctuary act 1 is the level you play with Sonic, act 2 is the final level for Knuckles. Death Egg shouldn't be playable with Knuckles, but you can! Go for a "new" level! (Some things may block you, however, like the boss of the act 1.) Doomsday act 1 is the final level with SuperSonic, and Doomsday act 2 is actually the giant Robotnik robot boss from Death Egg Act 2.
Having highlighted any stage, you can change the value of the number between Angel Island and Hidrocity with C. 00, 01 and 02 will select Sonic as the player for the stage, 03 will select Knuckles.
In the Sound Test, some music codes won't work. These are from Sonic 3. However, Sonic 3 sound fx is still here. There are many unused sounds, too (some of them from Sonic 2). Some of the last sound codes are not sounds but effects, which will modify the speed of the music playing, fade it, etc.

 

Slow Motion:

With the Stage Select cheat enabled and the game paused, A will return reset the game, C will advance a single frame, and B will put the game in slow motion (you can move and jump with C). You'll hear the music in slow motion mode, but it will be glitchy. This is the correct behavior in the original console. However, in GENS, you'll hear the normal music at normal speed instead but this seems to be a bug in the emulator.