Sonic 3 & Knuckles

Sonic 3 & Knuckles is what happens when Sonic the Hedgehog 3 is inserted into Sonic & Knuckles by way of the "Lock-On" feature, creating the full third title of the Sonic series.

Level Select and Sound Test


Sonic 3 & Knuckles ' level select is performed similarly to that of Sonic & Knuckles: grab one of the rope swings in Angel Island Zone and press Left, Left, Left, Right, Right, Right, Up, Up, Up. If a chime plays, press Start then A to return to the title screen.

At the title screen, "Sound Test" will be available below "Competition". This will open up the level select menu (with a sound test at the bottom-right). Press C on this menu to change your character ( is Sonic & Tails, is Sonic,  is Tails, and  is Knuckles).

When this code is enabled, you can perform three actions while the game is paused: press A to return to the title screen, hold B to play at half-speed, or press C to advance frame-by-frame.

Debug Mode
Debug Mode is unlocked by entering Mushroom Hill Zone and grabbing one of the lifts, followed by pressing Left, Left, Left, Right, Right, Right, Up, Up, Up. If a chime plays, go into the level select and hold A while selecting a level.

Normal gameplay now has added debug features: press A to reverse gravity (reaching the top of the level will kill you as if you fell off a bottomless cliff), B to enter "edit mode", or B + C to play through all the frames of the current character's animations.

In edit mode, the coordinates of the current object and viewport are shown by the top and bottom line of hex digits in the HUD, respectively. Press A to cycle forwards through the object list (A + C to cycle backwards), B to return to normal gameplay, and C to place the current object shown.

Unused Arrow Lift Sprites


Some strange platform that isn't placed in any level, but the graphics fit perfectly with Launch Base Zone. It has no movement on its own when placed, and needs specific Pro Action Replay codes to do so.

Unused Music
The Sonic 3 tracks which were "replaced" in-game by their Sonic & Knuckles counterparts are still present, and can be heard in the Stage Select/Sound Test.

- Staff Roll