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Knuckles in Sonic 2 is a 2D side-scroller platform video game with the exact same gameplay as Sonic the Hedgehog 2 and Sonic & Knuckles. The only playable character here is Knuckles, who retains his moveset from Sonic & Knuckles.
The 2P Player VS and Options menu have been removed from the title screen due to only having one playable character. As such, there is only simply a "Press Start" option.
The color palettes for the Act title cards are colored green, red and yellow instead of blue, red and yellow.
The Shield is colored gray instead of its usual blue.
The Goal Plate will land on Knuckles's portrait instead of Sonic's or Tails's. The Goal Plate sprit used in here is an altered version of the sprite from Sonic & Knuckles.
Secrets such as 1-UpItem Boxes have been added in some of the Acts for Knuckles to discover using his abilities.
When Knuckles respawns at a Star Post after losing a life or finishing a Special Stage, he retains the same number of Rings he had when he touched it rather than having zero Rings.
The Ring requirements to pass each checkpoint in the Special Stages are notably lower than those of the original Sonic 2, making them much easier for Knuckles.
The Special Stages do not display Knuckles's name like Sonic's and Tails's.
To transform into Super Knuckles, the player has to press // while in mid-air from a Spin Jump, as opposed to the original Sonic 2, where the player could turn into Super Sonic by simply jumping.
In addition, the player cannot transform into Super Knuckles after touching a Goal Plate or pressing the switch on the Capsule.
In Debug Mode, the player is limited to placing a Ring or a Super Ring Item Box.
Cheats[]
Level Select: At the title screen, the player has to input the following in order: ↑ ↑ ↑ ↓ ↓ ↓ ← → ← →. A Ring chime will sound if successful. Then, hold and press Start to access the Act Select.
Debug Mode: At the Level Select's Sound Test, the player has to play the following tunes in order: 01, 09, 09, 04, 01, 00, 01, 08 (1994-10-18, or 18 October 1994, the release date of Sonic & Knuckles). A Ring chime will sound if successful. Then, the player can highlight any Act and select it while holding to play it with Debug Mode.
All 7 Chaos Emeralds: At the Level Select's Sound Test, the player has to play the following tunes in order: 01, 06, 07, 07, 07, 02, 01, 06.
Though Sonic and Tails are replaced by Knuckles and locked by default, Tails is still piloting the Tornado in Sky Chase Zone and during the ending of the game.
In the 2013 remaster of Sonic the Hedgehog 2, Knuckles was added as a playable character, allowing the player to play as him the same way as in Knuckles in Sonic 2 with the same title screen. However, the color palettes of the Act title cards and the Shield were reverted back to their original colors when playing as Knuckles.
In the v2.0.0 patch of Sonic Origins, the title cards were changed back to the Knuckles in Sonic 2 palette, although the Shield still retains its original color.
Knuckles's arms are miscolored tan in the Special Stages.
This is also the reference used to enable Debug Mode in Sonic 2.
Movement
left/right
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