Need Patch regarding GBA Graphics (Yu-Gi-Oh - The Sacred Cards)

Mao_Dedong

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May 11, 2025
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Hello Everyone.
I try to insert new card-artworks (80x80pixels/64colors/8bpp) into the game "Yu-Gi-Oh - The Sacred Cards".
The artworks in this game are compressed in 8-bit Huffman, pointer table for the card images starts at 0xD97B7C and the first card image is located at 0x5AFC68.

The problem now is that any attempt to insert this new graphics fails, exactly the same as described in a thread 10 years ago regarding "Yu-Gi-Oh - Reshef of Destruction" (the successor to Sacred Cards), in which only the left-most column of pixels are shown correctly. Anything else is displayed as a mess of pixels.

Here is the thread: https://forums.warsworldnews.com/viewtopic.php?f=11&t=13599#top

Apparently it has to do with a hardcoded function in the game code itself, which can only be solved via patch.
I tried the provided patch there for RoD myself and it works perfectly.

Is someone willing to create such a patch regarding this issue for The Sacred Cards and share it here?
I am quite new to romhacking, so any help is appreciated.
 


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