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A successful tweak.

Tweaking is a glitch exclusive to the core series Generation IV games that causes the game to fail to load the graphics of an area. It is also sometimes referred to as holepunching to commemorate its discoverer, a GameSpot forums member by the name of "Holepunch".


All maps in Generation IV are broken up into square "sections" or "chunks" 32 tiles by 32 tiles across. At any given time, only four sections are loaded and visible: the section the player is currently in as well as two sections orthogonally away and one diagonally away, depending on which quadrant of the current section the player is in. (For example, if the player is standing in the northwest quadrant of their current section, the sections to the north, west, and northwest will be loaded.) "Load lines" exist halfway across each section at the boundaries between quadrants, so named because when the player crosses over one, the sections in that direction are loaded into memory, while the sections behind the player are unloaded. Through this, the overworld appears seamless.

Using the Bicycle in the fourth gear, however, can cause the player to move too fast for the game to load the areas properly, especially if one changes direction several times while near the intersection of two load lines, thus loading and unloading multiple sections over and over nearly simultaneously. Doing so triggers a race condition bug, causing sections to load improperly. The effects can vary from a game freeze, invisible walls, a completely black area, a completely white area, a change in the Z-axis location, or even a completely different section fully loading in the wrong place.

The distortion caused by tweaking can be solved easily by crossing a load line away from the distortion, causing it to unload. When the section is loaded again, it will be normal. It can also be solved by looking at a different menu screen such as the Pokédex; upon closing out of the menu, the areas will be properly reloaded.

While tweaking using the bicycle in the fourth gear is the most common method to perform tweaking, the same effects can also occur using only the third gear, although its applications are not as versatile. It is even possible for some limited effects to occur simply by running (as well as Surfing in Platinum, which is at the same speed), mainly invisible walls and Z-axis changing rather than drastic graphical changes.


050Diglett.png This section is incomplete.
Please feel free to edit this section to add missing information and complete it.
Reason: writeup quality; better image than ASCII art; diagonal displacement with fast bike (necessary in HGSS); running tweaks and their effects.

In the diagram above, the vertical and horizontal lines represent load lines (thus this is the center of a section) and the numbers represent tiles that the player can walk on. (For example, taking one step east from 1 will bring the player to 2, crossing a load line in the process.)

In all patterns detailed below, the patterns can be flipped and rotated to produce displacements in different directions.

Orthogonal displacement

"3124343" (fast bike): Nicknamed a "zorch" after its discoverer, this was the first reliable tweaking pattern ever discovered. It causes the section east of the player to load as a black area onto the section west of the player. Obsoleted by the later-discovered "shortzorch".

"42121" (fast bike): Nicknamed a "shortzorch", this has the same effect as a zorch.

Diagonal displacement

"12421" (slow bike): Causes the section northeast of the player to fully (visibly) load onto the section northwest of the player. Possible with only the third gear bike since sections diagonal to the player are farther away and load last, making it easier to interrupt the process.


Depending on the layout of a section, it is possible to tweak in such a way so as to load a walkable area (either black or visible) onto a section that does not normally contain walkable surfaces. This allows for a number of shortcuts, such as skipping Tohjo Falls and therefore HM07 (Waterfall) in Pokémon HeartGold and SoulSilver by loading a black area onto the section where the ledge on Route 27 would normally be. In sections containing buildings that are blocked off by NPCs, it is possible to enter them by tweaking a Z-axis change, allowing the player to walk under or over the tile the NPC would normally occupy.

These types of shortcuts are possible in all Generation IV games.

Void glitch

The void glitch is a specific application of the tweaking glitch only possible in Pokémon Diamond and Pearl. First, the player must tweak a black area onto a section that would normally contain buildings, making it possible to walk through their improperly loaded walls. Then, by standing exactly one tile above the entrance to a building, reloading the area, and walking south, the player can end up on the interior map of the building, but in the black void area around the normally accessible portion, similar to the Surf glitch. As with the Surf glitch, it is then possible to navigate through the interconnecting area of this void to normally inaccessible overworld locations, most notably Newmoon Island and the Flower Paradise, where the event-exclusive Darkrai and Shaymin reside. If the player walks more than 65,535 steps in the void, the game copies map data of already existing areas due to the 65,535 byte limit. This is called Fake Sinnoh (Diamond, Pearl and Platinum) or Fake Johto/Kanto. (HeartGold and SoulSilver) The funthing with the "fake" regions is that you can almost walk over everything.

The only known location where a path to Darkrai or Shaymin has been successfully found is the void area around the Pokétch Company building in Jubilife City.

As the player is required to save the game in the void as part of the path to access Darkrai and Shaymin, the same risks associated with the Surf glitch occur here, such as becoming trapped without a method of escape. More notably, as the maneuvers in the void necessary to reach Newmoon Island and Flower Paradise are significantly more elaborate than with the Surf glitch (with the complete path to Darkrai requiring about two hours and the complete path to Shaymin requiring about one hour), it is possible for more serious corruption-related effects to occur. In the worst possible circumstance, the game may always immediately freeze upon loading the save file, forcing a new game to be started.

It is currently believed, although not conclusively proven, that the Hall of Origin is impossible to access with this glitch, as it is a closed-off indoor area without a single entry warp, thereby making it almost impossible to safely locate in the void compared to outdoor areas and indoor areas with many warps such as Turnback Cave. Regardless, as with the Surf glitch, it is impossible to battle Arceus this way, due to several reasons (see here for more information).

Other areas that can be accessed through this glitch include the Hall of Fame, Giratina's room in Turnback Cave, and Route 227. As the void glitch simply requires a Bicycle to perform, all of these areas can be reached as early as the game's second Badge.

In Pokémon Platinum, HeartGold, and SoulSilver, navigation of the void is no longer legitimately possible due to the presence of invisible walls that can trap the player. Currently the only known way to bypass these and proceed through the void is with a proper "walk through walls" cheat code. In addition, in Platinum, Darkrai, Shaymin, and Arceus will not appear in their respective areas unless the player has obtained the proper event item, making attempts to reach said areas futile even if the void were traversable or some other method of access found.


Tweaking in order to get Darkrai

By auburneye
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

Tweaking in order to get Shaymin

By auburneye
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

Fake Sinnoh

By Name Test Name
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

Fake Johto/Kanto

By Crystalmourne
This video is not available on Bulbapedia; instead, you can watch the video on YouTube here.

See also

In other languages

Language Name Translation
French Tweaking Trick Literally the "tweaking trick".
German Tweaken Tweaking.
Spanish Glitch Tweaking Tweaking glitch.
Italian Tweaking Tweaking.
Japanese tweakingバグ[1] Combination of tweaking and バグ; bug. Note that a specific name is often avoided for void exploring in the Japanese Pokémon community but Tweaking in Jubilife City has been referred to as performing a specific task (Japanese: 特定の操作をする).
Korean 비틀기 버그[2]


  1. Yahoo Japan Answers.
  2. 비틀기 버그 (Tweaking Glitch) - 관동 스토리 뛰어넘기 [포켓몬스터 4세대].

Cloning glitchesGlitch PokémonGlitch Trainers
Error messagesArbitrary code execution
Generation I: --0 ERRORCable Club escape glitchExperience underflow glitchFight Safari Zone Pokémon trickGlitch City
Item duplication glitchItem underflowMew glitchOld man glitchPewter Gym skip glitch
Pokémon merge glitchRhydon glitchSelect glitches (dokokashira door glitch, second type glitch)
Super GlitchTime Capsule exploitZZAZZ glitch
Generation II: Celebi Egg glitchCoin Case glitchesExperience underflow glitchGlitch dimension
Glitch EggSketch glitchTeru-samaTime Capsule exploitTrainer House glitches
Generation III: Berry glitchDive glitchPomeg glitchGlitzer Popping
Generation IV: Acid rainGTS glitchesMimic glitch
Pomeg glitchRage glitchSurf glitchTweaking
Generation V: Sky Drop glitchFrozen Zoroark glitch
Generation VI: Lumiose City save glitchSymbiosis Eject Button glitch
Generation VII:
Glitch effects: Game freezeGlitch battleGlitch song
Gens I/II only: Japanese characters in the international versions
Gen I only: Glitch screenTMTRAINER effectInverted sprites
Gen II only: Glitch dimension
Lists: Glitch movesGlitch types
Glitch Pokémon (Gen IGen IIGen IIIGen IVGen VGen VIGen VII)
Glitches (Gen IGen IIGen IIIGen IVGen VGen VIGen VIISpin-off)

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