Sonic & Knuckles Collection

Sonic & Knuckles Collection is a Sonic the Hedgehog compilation game for Microsoft Windows-based PCs.

The ports have all of the music emulated in MIDI format. Some music (Carnival Night Zone, IceCap Zone, Launch Base Zone, Knuckles' theme, the Sonic 3 Credits theme, the sub-boss music from Sonic 3, and the Competition main menu) was replaced with original music. One possible explanation for this is that the pieces of music from the Genesis version used sound effects not contained within the general MIDI standard, and many sound cards at the time of release did not have the capability to play additional samples along with the MIDI. Another explanation for the replacement is that the songs were replaced due to legal reasons, because connections could be made between similar songs by Michael Jackson. Other than that, the gameplay is identical to their Genesis counterparts.

This game is virtually impossible to play in windowed mode on any system with a CPU faster than 350 MHz, because the game does not have proper speed-limiting routines in this mode. However, the timings used by the game are based on the monitor's refresh rate. Switching the game to fullscreen mode lets the game play properly, no matter what your system speed is. In windowed mode, the game can be played at the correct speed whenever the screen refresh rate is at 60Hz. Sega has also provided a patch to fix this problem without reducing the refresh rate.

The collection includes:
 * Sonic the Hedgehog 3
 * Sonic & Knuckles
 * Sonic 3 & Knuckles
 * Blue Sphere (in options dialog as "Special Stage Mode")

The European and North American versions of the collection also includes Sonic the Screensaver which the player can customize Windows with Sonic themes, wallpapers, icons, and music from Sonic 1, 2, 3 & Knuckles, and the Japanese soundtrack of Sonic CD in 11kHz WAVV format. However, in Japan, Sonic & Knuckles Collection and Sonic the Screensaver were released separately on the same day.

Photos
Wallpapers included in Sonic the Screensaver:

Trivia

 * The sound test was featured in the options mini toolbar for the game, because a glitch would occur and the game would reset if the player tried to listen to a song.
 * Mushroom Hill's Act 1 music had the beginning sound removed for this compilation.
 * A song was included in this compilation that does not exist anywhere else. It's unknown if it was meant to replace a song from the console versions or not. The song also bears some resemblance to the theme of "Green Hills Zone" and its vocal counterpart, "Sonic - You Can Do Anything" from the Japanese/Euro Sonic CD soundtrack.

Other Glitches

 * ​​Angel Island Airplane Crash: Either use the code 7224LFCP or turn into debug until you hear a die sound.
 * Angel Island Sonic in Knuckles': To do this glitch you need Tails. Have Tails carry Sonic up then stop flying. If you have Hyper Sonic, you can double jump through the dirt. You can skip the Mini-boss if the game is Sonic 3. NOTE: If the game is Sonic 3 & Knuckles you are fighting 2 Robotniks.
 * Hidrocity Debug Glitch: Now this may be tricky, but unlock debug and go to Hidrocity. Go to the top of the level then debug through the slide. You will be fighting a Carnival Night Mini-boss. When defeated the game will reset.
 * Marble Garden Sonic in Knuckles': This is in Act 2. Go to the Mountain ontop of the level. Then get ALOT of spindash. then at the point when the mountain stops... JUMP! You can't usually go through the barrior. Unlock Debug. The game will think you're Knuckles cause' that area is also Sonic's. Weird... O.O
 * Marble Garden Bypass Mini-boss: Spindash in the boss room, but don't go too far. Now Screen Scroll Glitch. The minute you do the Screen Scroll Glitch, Hold right. You just bypassed the Mini-boss! You can also fight Robotnik in a Special Stage Room.
 * Carnival Night Underwater: Get to the place where Knuckles shuts the lights off. Then have Tails lift the barrior you just went through. Keep on going backwards and... You're in Carnival Night Underwater!
 * Flying battery Debug Glitch: Turn into an enemy now place it. Now die and Quickly turn back into Debug. The game will have a hard time about the Engine. NOTE: Every time you Debug, The game will freeze for 20 seconds.
 * Sky Sanctuary Knuckles in Sonic's: Play as Knuckles then go unlock Debug. Now go to Sonic's Sky Sanctuary.
 * Sky Sanctuary Debug Glitch: Debug To the boss Platform but don't touch it. Now Turn into Sonic. The screen will not lock but Mecha Sonic's sprites will be corrupted.
 * Sky Sanctuary Debug Glitch 2: Same as first but touch the boss platform. Defeat Mecha Sonic. Then jump left the minute the stage ends. The game will show the sky. Nothing to do but reset the console.
 * Doomsday Knuckles in Sonic's: Unlock debug and Go to Doomsday. Now debug before you TRANSFORM. NOTE: If you dont have debug. Knuckles won't fly. He will fall again and again and again...