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.

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.

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 00000004 C222C418 C0030000 EC110032 D0030000 C2229F00 D223000C 38800001 00000000 0419D8CC 4E800020

NTSC-J
F6000001 80008180 C05F00C8 C07F00BC D200001C 00000006 3DC03F40 91C28004 C2228004 C0030000 EC110032 D0030000 C003000C EC110032 D003000C 38800001 60000000 00000000 E0000000 80008000 F6000001 80008180 D0430050 D0630054 D2000000 00000003 3DC040AF 91C28004 C0428004 D0430050 60000000 00000000 E0000000 80008000 F6000001 80008180 FFA01090 93E10024 D2000000 00000003 3DC03FAA 61CEAAAB 91C28000 C2628000 EFB300B2 00000000 E0000000 80008000 F6000001 80008180 FF601090 7C7F1B78 D2000000 00000004 3DC03FAA 61CEAAAB 91C28004 C2228004 EF7100B2 39C00000 60000000 00000000 E0000000 80008000

PAL
F6000001 80008180 C05F00C8 C07F00BC D200001C 00000006 3DC03F40 91C28004 C2228004 C0030000 EC110032 D0030000 C003000C EC110032 D003000C 38800001 60000000 00000000 E0000000 80008000 F6000001 80008180 D0430050 D0630054 D2000000 00000003 3DC040AF 91C28004 C0428004 D0430050 60000000 00000000 E0000000 80008000 F6000001 80008180 FFA01090 93E10024 D2000000 00000003 3DC03FAA 61CEAAAB 91C28000 C2628000 EFB300B2 00000000 E0000000 80008000 F6000001 80008180 FF601090 7C7F1B78 D2000000 00000004 3DC03FAA 61CEAAAB 91C28004 C2228004 EF7100B2 39C00000 60000000 00000000 E0000000 80008000

Also, If any of this previous Gecko codes for widescreen fixing gives you a 4:3 hud over 16:9 screen, you can try this AR Codes instead. Remember, as said before, to disable Widescreen Hack.

NTSC-U
0445391C 3FE38E39

NTSC-J
0444DA64 3FE38E39

PAL
044558DC 3FE38E39

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.

NOTE: While using custom textures, scent trails seen by wolf link can disappear. This isn't an issue until the player has to navigate Snowpeak. This issue has had little testing, and may be texture pack specific.