Sonic & Knuckles/Hidden content
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- 1 Level select
- 2 Debug mode
- 3 Eighth Special Stage
- 4 Hidden area of Hidden Palace Zone
- 5 Bow to Knuckles
- 6 Unused content
- 7 Misplaced objects
- 8 Cheat device codes
- 9 References
While in Mushroom Hill Zone, jump on to one of the pulley systems, then press . A Ring sound will confirm correct entry. Press , then to return to the title screen. Press + to go to the Level Select screen.
Though the Sonic the Hedgehog 3 Zones are listed, they are not available unless Sonic 3 is locked-on; selecting any of them will load Mushroom Hill Zone Act 1. The player's character can be chosen by pressing , though selecting 00 or 02 (normally associated with Tails) will override the player's character to Sonic.
Contrary to popular belief, there IS a debug mode available for this game. Sonic the Hedgehog 3 & Knuckles runs on the codebase of Sonic & Knuckles which has a separate check to enable a debug mode cheat code in place of the level select code in Mushroom Hill when Sonic 3 is locked on. To use debug mode purely in Sonic and Knuckles, the player needs to overwrite the memory of the game while a Sonic 3 cartridge or ROM is locked on. Simply start up Sonic 3 & Knuckles, unlock the level select and debug mode codes for that game and then highlight any level in the Sound Test, hold , press , and release when Sonic appears. Switch to an "S" Monitor, and paste a big amount of monitors until sprites begin to flicker. Then revert back to Sonic, and Spin Dash or jump straight into the monitors. Due to how the game loads its art, the game will break, crash or reset to demo mode. If the game has not crashed yet, press , and then press if necessary. The game may ignore any flags for a Sonic 3 cartridge being detected and it will boot up into Sonic & Knuckles mode, redirecting the player to the Sonic & Knuckles title screen. Choose any character, hold then press to go to the level select screen. Highlight any level, hold , then press .
- Press to reverse gravity when in normal mode.
- Press + to cycle through all mapping frames of the character when in normal mode.
- Press to toggle normal and debug mode.
- During pause press to fade to black and restart from the SEGA screen.
- During pause press and hold to enable slow-motion (this proceeds at half-speed for as long as the button is held down).
- During pause press to advance one frame.
- Current coordinates are designated by the top line of hex digits in the HUD.
- Viewport coordinates are designated by the bottom line of hex digits in the HUD.
Eighth Special Stage
If Sound Test is enabled, and any of the "Special Stage" options is selected, Sonic or Knuckles is taken to the first Special Stage. The end of it however, spawns a yellow Super Emerald. This is when the special stage is marked as clear, but the normal Chaos Emerald amount doesn't rise. The Super Emerald amount will rise, but it has pretty much no effect due to Super Emeralds being unobtainable in Sonic & Knuckles alone. This bug will allow access to a hidden Special Stage and allow for the 8th Emerald to be collected once the other six have, though.
Hidden area of Hidden Palace Zone
When using edit mode in Hidden Palace Zone, an area above and to the left of Sonic's fight with Knuckles contains a selection of monitors; six on the left, and three on the right. In Sonic 3 & Knuckles, Tails can fly up to this area.
It has been suggested that these could have been placed here so that clean screenshots could be taken for the Japanese manual. The manual clearly shows Sonic bubble bouncing in Hidden Palace, despite no Water Shields being available through normal play.
Bow to Knuckles
After Knuckles has let the player across in Sky Sanctuary Zone, if the player stands in a certain spot and bow (duck) with , as is customary in Japan, Knuckles turns around and gives a "get going" gesture.
|Vertical hanging sprites for Knuckles.|
|A monochrome death sprite for Knuckles.|
|An unused, slightly different version of Hey Ho.|
|An unused frame for Eggman for use with the Hang Mobile when attacking. It doesn't appear due to a programming oversight.|
|An unused piece of the Egg Golem boss.|
|A jumping frame for Eggrobo.|
|Slot machine image for Super Sonic, intended for the Slot Machine Bonus Stage.|
|A flashing S gumball. One could presume it has something to do with Super Sonic.|
|Unseen palm tree graphics. Although these tiles are used in both Sonic 3 and Sonic 3 & Knuckles in the introduction to Angel Island Zone, they are hidden behind leaf sprites. This is how it looks with the sprites layer disabled:|
Placeable in edit mode
|A lava stepping stone for the second Act of Lava Reef Zone. Similar objects exist in Act 1, but this unique art for Act 2 is never seen.|
|A platform for the Glowing Spheres Bonus Stage.|
|"F" gumball, placeable in Glowing Spheres Bonus Stage. When collected it makes the same noise as a Bumper Ball, but it doesn't do anything.|
|A rotating holograph of the Death Egg. It can be found by hex-editing a savestate of Death Egg Act 2. At address A500 replace 01 with E5 and the most northwestern piece will change to this. Thanks to Gold for finding this.|
|A solid block that uses art for the slot in the Slot Machine Bonus Stage.|
Tails is playable in the game through hacking. Unfortunately, most of his sprites are missing. A savestate (info) (50 kB) of Tails in Sonic & Knuckles is available. If the PAR code FFFF09:02 is used in Sonic & Knuckles, Tails will be usable, but just about every sprite of his, except the transformation sprite, will be missing, basically rendering him invisible (unlike when a savestate is used; a different, glitchy sprite is used in place of Tails's original one). However, his sprites used at the end of Sky Sanctuary Zone to run around the collapsing pillar are actually stored in the Sonic & Knuckles' ROM and therefore are visible. The same sprites are used also in the same context in Lava Reef Zone.
Flying Battery Zone Act 1
There are two yellow springs buried in the ground near the first giant purple tube.
Death Egg Zone Act 1
Cheat device codes
These are cheat codes that can only be used with game enhancer devices. Support for these codes is available in most emulators.
Official Codes, Sonic & Knuckles Alone
|Code||Description||Works in S&K||Works in S3K|
|AFKT-AAG0||Start with 1 life.||Yes||No|
|AKKT-AAG0||Start with 2 lives.||Yes||No|
|AVKT-AAG0||Start with 4 lives.||Yes||No|
|AZKT-AAG0||Start with 5 lives.||Yes||No|
|A7KT-AAG0||Start with 7 lives.||Yes||No|
|BFKT-AAG0||Start with 9 lives.||Yes||No|
|DFKT-AAG0||Start with 25 lives.||Yes||No|
|GKKT-AAG0||Start with 50 lives.||Yes||No|
|NPKT-AAG0||Start with 99 lives.||Yes||No|
Official Codes, Sonic the Hedgehog 3 Locked-on
|Code||Description||Works in S&K||Works in S3K|
|AWXT-CA4C||Don't lose rings when hit.||Yes||Yes|
|96BA-CAG6 + 98MA-CAF0||Keep elemental shields when hit.||Yes||Yes|
|AKVT-AA76 + AMNA-EA24||Keep rings between levels.||Yes||Yes|
|RHJA-E60L||Bonus round always activated after every checkpoint.||Yes||Yes|
|RGSA-A6YY||Only 1 blue sphere needed to get a chaos emerald.||Yes||Yes|
|ALNA-AACR||Rings worth 2 in special stage.||Yes||Yes|
|ARNA-AACR||Rings worth 3 in special stage.||Yes||Yes|
|AWNA-AACR||Rings worth 4 in special stage.||Yes||Yes|
|A0NA-AACR||Rings worth 5 in special stage.||Yes||Yes|
|BLNA-AACR||Rings worth 10 in special stage.||Yes||Yes|
|NTPT-CA50||Rings aren't used up as Super (or Hyper) Sonic/Knuckles.||Yes||Yes|
|RENT-C6YA||Can always double jump (can't use water shield or become Super Sonic).||Yes||Yes|
|RENT-C6V6||Can always use Fireball Spin Dash (can't double jump, bounce, or become Super Sonic).||Yes||Yes|
|AANA-CNA0||Jump a little lower (same height as Knuckles jump).||Yes||Yes|
|4ANA-CRA0||Jump a little higher.||Yes||Yes|
|2ANA-CWA0||Jump a lot higher.||Yes||Yes|
|AANA-C4A0||Jump really high.||Yes||Yes|
|AANA-DYA0||Jump ridiculously high.||Yes||Yes|
|A2NT-CAG6||Only 6 chaos emeralds needed to become Super Sonic.||Yes||Yes|
|AYNT-CAG6||Only 5 chaos emeralds needed to become Super Sonic.||Yes||Yes|
|ATNT-CAG6||Only 4 chaos emeralds needed to become Super Sonic.||Yes||Yes|
|ANNT-CAG6||Only 3 chaos emeralds needed to become Super Sonic.||Yes||Yes|
|AJNT-CAG6||Only 2 chaos emeralds needed to become Super Sonic.||Yes||Yes|
|AENT-CAG6||Only 1 chaos emerald needed to become Super Sonic.||Yes||Yes|
|AANT-CAG6||Become Super Sonic without any chaos emeralds.||Yes||Yes|
|NTNT-CAHL||100 rings needed to become Super Sonic instead of 50.||Yes||Yes|
|FANT-CAHL||40 rings needed to become Super Sonic.||Yes||Yes|
|DENT-CAHL||25 rings needed to become Super Sonic.||Yes||Yes|
|BJNT-CAHL||10 rings needed to become Super Sonic.||Yes||Yes|
|AENT-CAHL||1 ring needed to become Super Sonic.||Yes||Yes|
|AANT-CAGY + AAPA-CAB8||Become Hyper Sonic without any emeralds.||Yes||Yes|
|TB5T-CNCR||Jumps as high as Sonic (slightly higher than usual).||Yes||Yes|
|A36A-CACW||Only 6 chaos emeralds needed to become Super Knuckles.||Yes||Yes|
|AZ6A-CACW||Only 5 chaos emeralds needed to become Super Knuckles.||Yes||Yes|
|AV6A-CACW||Only 4 chaos emeralds needed to become Super Knuckles.||Yes||Yes|
|AP6A-CACW||Only 3 chaos emeralds needed to become Super Knuckles.||Yes||Yes|
|AK6A-CACW||Only 2 chaos emeralds needed to become Super Knuckles.||Yes||Yes|
|AF6A-CACW||Only 1 chaos emerald needed to become Super Knuckles.||Yes||Yes|
|AB6A-CACW||Become Super Knuckles without any chaos emeralds.||Yes||Yes|
|NV6A-CADA||100 rings needed to become Super Knuckles instead of 50.||Yes||Yes|
|FB6A-CADA||40 rings needed to become Super Knuckles.||Yes||Yes|
|DF6A-CADA||25 rings needed to become Super Knuckles.||Yes||Yes|
|BK6A-CADA||10 rings needed to become Super Knuckles.||Yes||Yes|
|AF6A-CADA||1 ring needed to become Super Knuckles.||Yes||Yes|
|AB6A-CACL + AB6A-CAHR||Become Hyper Knuckles without any emeralds.||Yes||Yes|
|Code||Description||Works in Gens|
|009760:6048||Red Spheres have no effect in special stages||Yes|
|0097AE:6672 + 0097C8:4E75||Collision disabled for bumpers in special stage||Yes|
|FFFE12:0063||Always have 99 lives||Yes|
|FFFE21:0063||Always have 99 rings||Yes|
|FFB038:00xx||Have character ID of (00=Sonic, 01=Tails, 02=Knuckles) (controls things like wall-breaking and character-specific boss fights).||No|
|FFFF0B:00xx||Character modifier (00=Sonic & Tails, 01=Sonic, 02=Tails, 03=Knuckles, 04=Blue Knuckles).||No|
|FFFFE0:0101||Level select and slow motion enabled.||Yes|
|00380A:???? + FFF65F:0004||Sonic Color modifier(found by tailsisdumb make sure to replace the ???? with any 4-digit number)||Yes|
|00381E:0006||Tails is affected by above code(found by tailsisdumb make sure above code is enabled)||Yes|
|FFFFDA:0001||Debug mode always enabled (without holding A during level load)||No|
|FFE439:0001||Only one blue sphere required to get the emerald (turn off as soon as special stage HUD appears or else special stage results screen won't register emerald)||No|
|FFFFB0:0007||Have 7 Chaos Emeralds.||No|
|FFFFB0:0707||Have 7 Chaos and Super Emeralds.||Yes|
|FFFFB2:0?0? + FFFFB4:0?0? + FFFFB6:0?0? + FFFFB8:0?0?||Emeralds in SRAM modifier. Replace ? with 0 = No Emeralds, 1 = All Chaos Emeralds, 2 = Hidden Palace Emeralds, 3 = Hyper Emeralds. Verified to work in Sonic 3 & Knuckles only.|
|006B68:0A94||Play as red Sonic (choosing to play as Knuckles produces Sonic with Knuckles' palette)
~courtesy of ShanMan
|FFB15D:FFFF||Blue Knuckles in first save slot. Save slot should be empty. The Blue Knuckles has Sonic's pallete, Knuckles' abilities(floating, etc.), Sonic's Sprite in Special Stage, Labeled as Sonic in Lives. The code is pretty unstable, crashes sometimes.
|FFFE10:XXYY||Stage/Act Modifier. X=Level; Y=Act. Set Y to 00 for Act 1, and to 01 for Act 2.
|Sonic & Knuckles|