The Legend of Zelda: Twilight Princess (GC)

In The Legend of Zelda: Twilight Princess, the next chapter in The Legend of Zelda series, Link can transform into a wolf to scour the darkened land of Hyrule. With the help of Midna, a mysterious being, you must guide Link through hordes of foul creatures and challenging bosses using new moves and a new horseback combat system. Many puzzles stand between Link and the fulfillment of his quest, so you must sharpen your wits as you hunt for weapons and items.

The GameCube version isn't mirrored like the Wii version and has free camera control. The GameCube version lacks motion controls while the Wii version does not support the GameCube controller. Although it can be patched from 4:3 to 16:9 as detailed below, there's no native widescreen support, unlike the Wii version.

Problems
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Hyrule Field Slow Down
As the player progress through the game, Hyrule Field will become progressively slower. To fix it, enable the "Hyrule Field Speed Hack" in the ISO properties (right click the game in the game list > Properties > Patches tab > Hyrule Field Speed Hack). The NA and EU releases had the patch added to their GameINIs in, then JP was added in.

Unfortunately, the hack will reduce the quality of the minimap, so be warned.

Minimap

 * On Direct3D api, minimap will have some noise artifacts if Anti-Aliasing, Anisotropic Filtering, or Texture Filtering are enabled. Disable all 3 in order to get "clean" map. For OpenGL, disable Anti-Aliasing.
 * The Hyrule Field Speed Hack can also cause issues with the minimap.

Sun Rays
Twilight Princess uses a ray effect at various points throughout the game, most notably at windows and the fountains. The effect is very easily broken. How it is broken depends on the backend used:
 * D3D - Anti-aliasing and an Internal Resolution above 1x Native damage the effect. Possibly fixed in, or at least made equivalent to OpenGL.
 * OpenGL - The GLSL merge greatly improves the effect in OpenGL. It is now only affected by Anisotropic Filtering and an Internal Resolution above 1x Native.

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16:9 Aspect Ratio Fix
The built-in Widescreen Hack causes clipping and reflection issues. The following Gecko codes work as a replacement, causing fewer issues. To avoid conflicts, make sure that Widescreen Hack is disabled while using these codes.

NTSC-U
04453FD4 3FE79E7B 0445391C 3FE79E7B C22E97F0 00000007 3CA08027 60A52A20 80010114 7C050000 4182001C C222C418 C0030000 EC110032 D0030000 C2229F00 D223000C 38800001 60000000 00000000 C21B76F0 00000002 3C603FAD 90610008 C0010008 00000000 C219D8FC 00000002 3C603FAB 9062A248 C002A248 00000000 C219DD3C 00000002 3C003F80 9002A248 80010064 00000000 04453900 BF400000 04455E18 3F400000 041FE28C 380002C5 C21FE278 00000002 38A0FF9B B0A48000 38A00000 00000000 C21FE2C0 00000002 38A0FF9B B0A48000 38A00000 00000000 C2182198 00000004 3C603FAB 90628000 C01D0100 C2228000 EC110032 D01D0100 387D0100 00000000 C21821A8 00000004 3C603F40 90628000 C01D0100 C2228000 EC110032 D01D0100 7FC3F378 00000000 04453A14 C5000000 04453A30 45800000 C220DFD8 00000003 3C6042CA 90610004 C3810004 C3BF0018 EFBDE028 00000000 C2214BEC 00000003 3C0042CA 90010004 C0410004 EC3E1028 60000000 00000000 C2216B04 00000003 C0240360 3C0042CA 90010004 C0410004 EC22082A 00000000 C2216574 00000003 C0240350 3C0042CA 90010004 C0410004 EC22082A 00000000 C22155A8 00000002 3C00C2CA 900305E8 60000000 00000000 C22158E0 00000002 3C00C2CA 900305EC 60000000 00000000 C2215D60 00000003 3C0042CA 90010004 C0410004 EC3E102A 60000000 00000000 C2218304 00000003 3C0042CA 90010004 C0410004 EC3E1028 60000000 00000000 0421149C 60000000 C22114B8 00000002 3C0042CA 90010004 C0210004 00000000 C22469A4 00000002 3C00C2CA 90010004 C0210004 00000000 C22469F4 00000002 3C00C2CA 90010004 C0210004 00000000

NTSC-J
0444DA64 3FE79E7B

PAL
044558DC 3FE79E7B

Reduce Bloom Ghosting
Due to Dolphin's bloom issues with Store EFB Copies to Texture Only, a "ghost" image will appear around certain objects in areas with high amounts of bloom. To disable bloom completely, use an Action Replay code below. 

No Bloom Effects [Ralf] 04009650 4E800020

Disabling Scaled EFB Copies can also reduce bloom ghosting at higher resolutions, by rendering the effect at its native resolution. It may, however, render other effects at the native resolution, and can decrease the clarity of these effects at higher resolutions.

HD Textures
There are many texture packs available:


 * By Victor Rosa. Their site is here.
 * This texture pack is incomplete and is in progress.


 * By ZeldaGamer23. Their site is here.
 * This texture pack is incomplete and is in progress. It is intended to be released April 2016.