Sonic & Knuckles
Debug mode in Sonic 3 and Knuckles
While playing sonic 3 and knuckles press Left, Left, Left, Right, Right, Right, Up, Up, Up in the mushroom hill zone, while on one of the pully things. (Just like level select in normal Sonic and Knuckles.) I think you have to do the level select code first.
|Left, Left, Left, Right, Right, Right, Up, Up, Up||Debug mode|
Contributed By: askg7.
Level select when locked onto Sonic 2
|At the title screen hit: Up, Up, Up, Down, Down, Down, Left, Right, Left, Right<p />If entered correctly you should hear a ring sound. Then hold A and press Start||Level select when locked onto Sonic 2|
Contributed By: Mysterious_Bob.
Walk through walls
On levels that allow you to travel upwards or downwards greatly as you progress as Sonic, go to an area where Knuckles' path starts. Hold down and wait for the screen to drop, then jump (do not spindash). If done correctly at a area that will cause this, the screen will shift and scroll in a loop back to you. During this time, you are free to walk through walls. This can also be done in select areas of levels where there is no path for Knuckles.
Contributed By: Flame060.
Complete each achievement to receive the allotted gamerscore.
|Unlockable||How to Unlock|
|Collect a Chaos Emerald.||Chaos Emerald (15)|
|Finish the Sandopolis Zone.||Desert Runner (15)|
|Collect 100 rings.||Extra Hedgehog (10)|
|Enter a Bonus or Special Stage.||Extra! Extra! (10)|
|Finish the Mushroom Hill Zone.||Fun Guy (10)|
|Collect all seven Chaos Emeralds.||Gettin' Super (25)|
|Finish the Flying Battery Zone.||Grease Monkey (15)|
|Finish the Lava Reef Zone.||Hot Feet (15)|
|Complete the game as Knuckles.||Knuckles Finale (25)|
|Earn a Continue in either a Bonus or Special Stage.||Please Continue (25)|
|Complete the game as Sonic.||Sonic Finale (25)|
|Start the game once as each character.||Two Sided (10)|
Contributed By: Guard Master.