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==Missing percussion glitch==
 
The '''missing percussion glitch''' is a glitch that occurs in the Mega Drive/Genesis game Sonic the Hedgehog. The sound driver fails to load the drum samples for the music playing, due to the fade in routine after collecting an extra life. Collect an extra life and immediately pause once the extra life jingle stops, before the music fades in. The percussion track in the music will no longer play.
 
===RequirementsNotes===
If the glitch is performed in the Special Stage, FM Channel 6 is disabled instead since this track has no percussion. The game doesn't need to be paused while performing the glitch while in the Special Stage, after gaining a life FM Channel 6 gets disabled. This glitch will not work in the Sonic Mega Collection port, and it is the only version of the game that the glitch will not work in.
#The player must gain an extra life.
 
{{YouTube|ItYToR1UDWo|Raven Freak}}
===Procedure===
#The player must quickly pause the game after the extra life jingle is done playing, and just before the music fades back in.
 
===Notes= Zip Glitch ==
When Sonic is inside of a wall, pressing a direction will result in Sonic being sent in the opposite direction that the player pressed at much higher speeds than Sonic is normally capable of. Getting inside of a wall can be done with the debug mode or other glitches.
If the glitch is performed in the Special Stage, FM Channel 6 is disabled instead since this track has no percussion.
 
The game doesn't need to be paused while performing the glitch while in the Special Stage, after gaining a life FM Channel 6 gets disabled.
=== Marble Zone Skip Glitch ===
This glitch will not work in the Sonic Mega Collection port, and is the only version of the game that the glitch will not work in.
In Marble Zone Act 2, walk to the very edge of this rising and lowering platform at the beginning of the level so that Sonic clips partially into the floor like this. <br>[[File:MarbleZipClip.png|200px]]<br> Press right and immediately jump. Sonic's position will wrap around the level to the end of the level. If Sonic touches the level ending before it properly loads, the sign's sprite will become glitched out. A similar effect can be achieved in Act 3 at the rising platform at the very beginning here <br>[[File:MarbleAct3ZipClip.png|200px]]<br> but instead of clipping sideways into the wall Sonic will drop under the platform. Wait for the platform on the left to reach its highest point, and press right and immediately jump. Sonic will zip all the way to the Robotnik fight.
 
=== Labyrinth Zone Act 2 Skip ===
In Labyrinth Zone Act 2, press this button <br>[[File:LabyrinthSkip.png|200px]]<br> and quickly jump onto the moving platform. Sonic will clip into the wall. Hold left and Sonic will zip to the end of the act.
 
=== Starlight Zone Act 1 Skip ===
===External Link===
In Starlight Zone Act 1, Use this moving platform to clip into the left wall like this.<br>[[File:StarlightSkip.png|200px]]<br>Tap right to zip to the end of the level.
A video of the glitch in action can be viewed here. [http://www.youtube.com/watch?v=ItYToR1UDWo]
 
== Labyrinth Zone Act 2 Crash ==
==Missing PRESS START BUTTON text glitch==
After clearing Act 2, hold down to pan the camera down and the game will crash with an illegal instruction exception.
 
== Lives Underflow Glitch ==
In Labyrinth Zone Act 3, with only one life remaining and no rings, hold onto a pole with Sonic to the left of some spikes. Let Sonic drown and Sonic will drown, lose a life, and then die on the spikes, losing another life, and Sonic's extra life counter will underflow to 255.
 
===External Link=Links==
The '''Missing PRESS START BUTTON text glitch''' is a glitch that occurs in the Sega Mega Drive/Genesis game Sonic the Hedgehog. The "PRESS START BUTTON" text that appears on the title screen in early prototype screenshots never appears in the final game, unless it is hacked.
*[http://info.sonicretro.org/Sonic_the_Hedgehog_(16-bit)/Bugs|Sonicretro Sonic 1 (16 bit) bug list]
==Explanation==
{{Youtube|O_6a-BJC0O8|A+Start}}
The glitch occurs because RAM isn't properly cleared, the byte that allows the text to be shown is shared with the two previous screens before the Title Screen and therefore the value is stuck in a no call state, rendering the text to never show up. A more thorough technical explanation of the glitch and fix can be found in this topic from Sonic Retro.([http://forums.sonicretro.org/index.php?showtopic=10240 see here])
[[Category:Sonic the Hedgehog series glitches]]
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