Sonic the Hedgehog/Game Mechanics and Glitches - Revision history

HDL: Changed slope glitch section from a joke to something useful.

2013-11-30T18:06:48Z

Changed slope glitch section from a joke to something useful.

HDL at 16:02, 29 November 2013

2013-11-29T16:02:57Z

Mike89: /* Level wrap */

2013-11-27T13:57:43Z

‎Level wrap

Mike89: /* Game Mechanics */

2013-11-27T13:55:08Z

‎Game Mechanics

Mike89: /* Game Mechanics */

2013-11-27T13:54:00Z

‎Game Mechanics

Mike89: /* Rolling and Spindashing */

2013-11-27T13:53:10Z

‎Rolling and Spindashing

Mike89: /* Game Mechanics */

2013-11-27T13:51:08Z

‎Game Mechanics

MarioGalaxy2433g5: MarioGalaxy2433g5 moved page Sonic the Hedgehog game mechanics and glitches to Sonic the Hedgehog/Game Mechanics and Glitches: Subpages

2013-06-16T15:35:47Z

MarioGalaxy2433g5 moved page Sonic the Hedgehog game mechanics and glitches to Sonic the Hedgehog/Game Mechanics and Glitches: Subpages

Mike89: /* Air Abilities (S3 and S&K only) */

2013-06-16T14:07:12Z

‎Air Abilities (S3 and S&K only)

Mike89: /* Insta-shield (Sonic 3 & Knuckles only) */

2013-06-16T12:31:44Z

‎Insta-shield (Sonic 3 & Knuckles only)

@@ Line 123: / Line 123: @@
 == Slope glitch ==
-TODO
+When you stand on a sprite-based object as it's destroyed, you enter a state in which you retain the angle of the last ground you landed on.  So for instance if you land on a curved mound of snow in Ice Cap, you will be able to walk as if you were always on that same curve, even if you're not anymore.  You can use this to enter ground and walls, as well as "hover" in the air.  It remains active until you land on top of a sprite-based object like a spring or crumbling platform.  It does not go away if you touch a sprite from the side.  With few exceptions, you cannot crouch during this state.
-−
-<setz> i have an explanation<br />
-<setz> it fucks up the game
 = Detailed physics information =
 *Sonic Retro's [http://info.sonicretro.org/Category:Sonic_Physics_Guide Sonic Physics Guide] is a fantastic resource for understanding how speed works in the Sonic games.
 *TASvideos has a much more in-depth analysis, mostly dealing with the way the engine works. It can be found at http://tasvideos.org/GameResources/Genesis/SonicTheHedgehog.html (this covers all three games in the classic series).

@@ Line 63: / Line 63: @@
 There's no guaranteed way to get a certain spindash speed, so usually runners do 3-taps or other increments in order to get close to the desired speed.
-Another quirk that further complicates rolling is that whenever you jump from one, you lose all control of your character. In Sonic 3, Sonic & Knuckles and Sonic 2 & Knuckles, doing your air ability will let you regain control mid air, but in Sonic 1 and Sonic 2 there's no way to manipulate your trajectory after a "rolljump".
+Another quirk that further complicates rolling is that whenever you jump from one, you lose all control of your character. In Sonic 3, Sonic & Knuckles and Sonic 2 & Knuckles, doing your air ability will let you regain control mid air, but in Sonic 1 and Sonic 2 there's no way to manipulate your trajectory after a "roll jump".
-Due to an error regarding Sonic's height in Sonic 2 whenever you rolljump into something and stop, you'll land 5 pixels above ground. This was fixed in Sonic 3 but consequently whenever you rolljump, you sink 5 pixels into the ground before taking off, which actually allow you to clip into the ground in Marble Garden 1 by a yellow spring as Sonic and Knuckles. Since Tails is smaller, he only sinks 1 pixel into the ground and thus can't do the same trick.
+Due to an error regarding Sonic's height in Sonic 2 whenever you rolljump into something and stop, you'll land 5 pixels above ground. This was fixed in Sonic 3 but consequently whenever you rolljump, you sink 5 pixels into the ground before taking off, which actually allows you to clip into the ground in Marble Garden 1 by a yellow spring as Sonic and Knuckles. Since Tails is smaller, he only sinks 1 pixel into the ground and thus can't do the same trick.
 == Air Abilities (Sonic 3 & Knuckles only) ==
@@ Line 75: / Line 75: @@
 == Camera timer ==
 The other kind is this one, which only starts moving once it's brought onto the screen (or near the screen - when the object is first rendered, in any case). Knowing which objects have which timing properties is important to good times when you have to deal with them.
 = Mechanics specific to Sonic =

@@ Line 114: / Line 114: @@
 == Level wrap ==
 This is what happens when a zip causes you to bypass the left edge of the screen. The game treats your X-coordinate in memory as a number less than 0 - but position coordinates are unsigned, so instead of a negative number it's a VERY large positive one - which correlates to the end of the stage. This requires some very specific circumstances depending on the level.<br />
-In Sonic 3 & Knuckles, a level wrap always puts you to x-position 32767, even if the stage isn't that long. To fill out the remainder of the map, the level repeats itself, this area is termed the "loopback". No sprites or path switchers exist in this area, but all the level geometry still exists, so you can maneuver around (somewhat) freely.
+In Sonic 3 & Knuckles, a level wrap always puts you to x-position 32767, even if the stage isn't that long. To fill out the remainder of the map, the level repeats itself, this area is termed the "loopback". No sprites or path switchers exist in this area, but all the level geometry still exists, so you can maneuver around (somewhat) freely. However, if the camera locks on a boss room, the character is automatically transported to that boss room.
 == Screen wrap ==

@@ Line 22: / Line 22: @@
 == Path switchers ==
 Path switchers are invisible objects in Sonic 2, Sonic 3 and Sonic & Knuckles that changes what path you're on and allows the levels to work as structured. These objects seamlessly switch the character from one path to another. This is especially necessary for things like loops to work. Knowing where these are and how they work is key to some tricks in the games.
@@ Line 28: / Line 30: @@
 == Speed cap ==
 In Sonic 1, the game imposes a horizontal speed cap of 6 p/f whenever all of the following is true:

@@ Line 22: / Line 22: @@
 == Path switchers ==
 Path switchers are invisible objects in Sonic 2, Sonic 3 and Sonic & Knuckles that changes what path you're on and allows the levels to work as structured. These objects seamlessly switch the character from one path to another. This is especially necessary for things like loops to work. Knowing where these are and how they work is key to some tricks in the games.
@@ Line 30: / Line 28: @@
 == Speed cap ==
 In Sonic 1, the game imposes a horizontal speed cap of 6 p/f whenever all of the following is true:

@@ Line 57: / Line 57: @@
 == Rolling and Spindashing ==
-Spindashing has 8 possible speeds, between 8 p/f and 12 p/f in half integers. Every time a button is pressed you add 2 to the base value 8, which then subsequently decreases faster the higher the total value is. Because of this, the minimum requirement to get a 12 speed is 6 button presses, commonly referred to as a "6-tap".
+Spindashing has 9 possible speeds, between 8 p/f and 12 p/f in half integers. Every time a button is pressed you add 2 to the base value 8, which then subsequently decreases faster the higher the total value is. Because of this, the minimum requirement to get a 12 speed is 6 button presses, commonly referred to as a "6-tap".
 Since you always decelerate while rolling unless going down a slope, getting back to running by jumping into ceilings, down slopes or inside loops are things you generally want to do after spindashing.
@@ Line 63: / Line 63: @@
 There's no guaranteed way to get a certain spindash speed, so usually runners do 3-taps or other increments in order to get close to the desired speed.
-Another quirk that further complicates rolling is that whenever you jump from one, you loose all control of your character. In Sonic 3, Sonic & Knuckles and Sonic 2 & Knuckles, doing your air ability will let you regain control mid air, but in Sonic 1 and Sonic 2 there's no way to manipulate your trajectory after a "rolljump".
+Another quirk that further complicates rolling is that whenever you jump from one, you lose all control of your character. In Sonic 3, Sonic & Knuckles and Sonic 2 & Knuckles, doing your air ability will let you regain control mid air, but in Sonic 1 and Sonic 2 there's no way to manipulate your trajectory after a "rolljump".
 Due to an error regarding Sonic's height in Sonic 2 whenever you rolljump into something and stop, you'll land 5 pixels above ground. This was fixed in Sonic 3 but consequently whenever you rolljump, you sink 5 pixels into the ground before taking off, which actually allow you to clip into the ground in Marble Garden 1 by a yellow spring as Sonic and Knuckles. Since Tails is smaller, he only sinks 1 pixel into the ground and thus can't do the same trick.

@@ Line 16: / Line 16: @@
 The levels themselves are built using "chunks" of 16x16 blocks (256 pixels) in Sonic 1 and 8x8 blocks (128 pixels) in later games. Every pixel is then divided into 128 subpixels and all movement is calculated with them.
 [[File:PathSwitcher.png|200px|thumb|right|Path switcher in effect]]
@@ Line 22: / Line 28: @@
 Sonic 1 doesn't switch paths with objects as all levels only have 1 solidity path. Instead, loops have a sort of area of transition.
 == Speed cap ==

← Older revision	Revision as of 15:35, 16 June 2013
(No difference)

@@ Line 65: / Line 65: @@
 Due to an error regarding Sonic's height in Sonic 2 whenever you rolljump into something and stop, you'll land 5 pixels above ground. This was fixed in Sonic 3 but consequently whenever you rolljump, you sink 5 pixels into the ground before taking off, which actually allow you to clip into the ground in Marble Garden 1 by a yellow spring as Sonic and Knuckles. Since Tails is smaller, he only sinks 1 pixel into the ground and thus can't do the same trick.
-== Air Abilities (S3 and S&K only) ==
+== Air Abilities (Sonic 3 & Knuckles only) ==
 In common for all air abilities is that they can only be executed while having an upwards velocity of less than 4 p/f. This is why you have to release the jump button and press it again in order to fly or instashield at the beginning of a jump, but can hold the button and press a new one at the apex of a jump.

@@ Line 80: / Line 80: @@
 Sonic is a bit taller than Tails which means some zips, clips and tricks work differently or not at all. An example of a zip that Sonic can do but not Tails is the one right before the Lava Reef 2 boss skip and an example of a zip Sonic can't do is the Death Egg 2 level wrap. Whenever Sonic is doing a rolljump, he sinks 5 pixels into the ground on the first frame as opposed to Tails who only sinks 1 pixel. This is the main reason Sonic can clip into the ground at the spring in Marble Garden 1 but not Tails.
-== Insta-shield (Sonic 3 & Knuckles only) ==
+== Shield properties (Sonic 3 & Knuckles only) ==
 In Sonic 3 there's a timer for instashielding that prevents you from doing it more often than about every second or so. This was removed in S&K.