Yu-Gi-Oh! Eternal Duelist Soul Hacking

Hello hello. I started to get frustrated with Gen 3 hacking, and randomly got interested in YGO. So today, in short, I bring you some resources for YGO Eternal Duelist Soul (GBA) hacking! The following are possible at the moment:

• 6bpp to 8bpp card graphics conversion
  
• Ban/limited list editing
  
• Booster pack editing
  
• Booster pack getting condition changing
  
• Booster pack graphics editing
  
• Card graphics editing
  
• Card stats editing
  
• Effects editing
  
• Fusion editing
  
• Opponent deck editing
  
• Ritual editing
  
• Starter deck editing
  
• Title screen editing
  

Everything can be edited using Hex Maniac Advance except for 6bpp card sprites. I highly recommend converting them to 8bpp so you can edit them easier within HMA.

Effect editing requires extensive knowledge of ARM7TDMI ASM, and extensive usage of HMA's THUMB viewer. You can ask me if you want anything coded, I like taking on challenges.

Also: I made a set of automation scripts for downloading/converting/inserting sprites in mass. I will update the thread when I clean up the code a little. I also made one big Google Sheets with formulas that can help you plan out a potential hack and insert stats/card names/card descriptions in mass as well.

Enjoy.

Google Sheets

HMA TOML

Discord

Credits:

• Yak Attack​
• Kertra (modded TM that reads 6bpp)​
• Haven (for making HMA)​
• YGOProDeck​
• Yugipedia​

Some great work there

I am looking for a competent reverse engineer to figure out some more complicated aspects of EDS hacking. Here's the checklist, in order of priority:

• AI: Find and edit functions so we can use new effect/spell/trap cards properly
• Effects: Some effects aren't in the existing table; we need to find them. (They might be the entries at the end, I don't know what a lot of them at the end are)
• Table expansion: This is a major hurdle to hacking EDS atm. Being able to add new cards/new card sprites and add more cards to the ban/limited lists and Fusion/Ritual pools would be a major step forward

If interested, join the Discord.

I'm glad to see this game getting some love! I've always looked around every year or soo for a rom hack of this game and couldn't find one.

If you could do this, I'd be stoked! Could you make a hacked rom or just a patch that removes the ban from the god cards to make them usable? Everything else I would want to be vanilla. That would be awesome!

Actually unbanning every banned card would be better, but I've always thought that the god cards were the only ones that were unusable in the game. How to you get the other ones that are in your picture?

So after research, I've learned that the monarchy, set sail for the kingdom, and glory of the kings hand are ticket cards. Yugipedia says they play the same roll as another game and that game says you temporarily possess them during tournaments, and can permanently own them by getting them by beating Simon. Are you able to verify if beating Simon has the ability to get these cards in some way?

I can't find anything relating to the cards that say none~111x
Do these cards have any type of images or roll or way to possess them in game?


Last question for you, if you can't get the ticket cards from Simon. Is it possible to make them be obtainable by Simon in some way? These cards would be okay to leave banned since they can't do anything in play anyways.

Wow, never thought I'd see a tool for romhacking EDS, much less one with this many features. Thanks for your work!

C-NICK said:

Wow, never thought I'd see a tool for romhacking EDS, much less one with this many features. Thanks for your work!

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Okay so I feel stupid now.... when I read this post, I understood it as they were making a romhack. Not making tools to hack roms with.

So with these tools, do you think I would be able to make a simple hack to enable the god cards for play in game?

I'm pretty sure that even though they are illegal by default, that their effects are still in game as there's a gameshark (code breaker?) Code to add all 3 on the field. I just want to be able to add them into my deck by default when acquired like any other card.

I cant code, but by the picture in the post, it looks to be a simple change a 0 to a allow 1 on the 3 cards. If there's more to it than that then it's beyond my comprehension.

Not ignoring you guys, I'll answer when I find time, but ADDING NEW CARDS (with new effects) IS NOW POSSIBLE

I am working on a hacking document, too. I will update the post when it is ready.

Mnunez123 said:

I cant code, but by the picture in the post, it looks to be a simple change a 0 to a allow 1 on the 3 cards. If there's more to it than that then it's beyond my comprehension.

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Yeah I'm also guessing the ban list is as straightforward as it looks, just change the 0 to 1. I haven't yet tried it, but as soon as I finish working on another game I will try it myself and see.

C-NICK said:

Yeah I'm also guessing the ban list is as straightforward as it looks, just change the 0 to 1. I haven't yet tried it, but as soon as I finish working on another game I will try it myself and see.

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Yes, it's as easy as changing the 0 to another number. If you want to expand the list, HMA can repoint and expand for you. It doesn't have anything tied to a specific length that I know of.

C-NICK said:

as soon as I finish working on another game I will try it myself and see.

Click to expand...

Awesome thanks! You know what though? I opened this game in hma and changed the address in the ban list of the cards as shown in the picture from 0 to 1 and the game allows me to add 1 of each card to the deck, but when in dual, if a card is drawn in hand or sent to the graveyard, the game still does not allow any way to summon them. If in the graveyard, I've tested monster reborn and call of the haunted, they don't show up in the list of monsters. I've also completely filled the field with monsters to see if it was a summoning requirement, and no. When you look at the cards it still shows them as being banned and unable to be played.

I'm thinking that in another address somewhere another digit has to be flipped. I don't think it's going to be a difficult procedure to get the cards to work. I think the most difficult part will be finding the address associated with summoning these cards in game. Idk I don't understand the hex and rom hacking from a coding point of view yet. I wouldn't mind learning though, I just don't know where to even start.

Edit: upon further thought, I'm thinking that the problem could be in the effect part of each card. For example the effect is all there but there could be either a no summoning ability there also, or the summoning requirement could be something too high (ie 6 cards to summon when the field only has 5 slots) I'm unsure if this could be something that would be possible to fix, if my thought is correct could this even be fixed? because what yak attack was saying about effects requires extensive knowledge. I hope that this isn't actually the case and there's just an area that needs to change the ban part of these cards.

Edit 2: after relearning of the effects of the god cards, they must be normal summoned and can not be special summoned. This answers why monster reborn and call of the haunted dont work. But doesn't answer why 3 monsters on the field don't allow the card to be summoned when in hand.

Yak Attack said:

Not ignoring you guys, I'll answer when I find time, but ADDING NEW CARDS (with new effects) IS NOW POSSIBLE

I am working on a hacking document, too. I will update the post when it is ready.

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Never even crossed my mind buddy, we all have a life we have to live and this is a passion project more than anything.

The document sound amazing! Thanks for making these things possible! Like I said I would check every now and again for rom hacks of this game for years so now that the time is almost here, I can wait a little longer.