ROM Hack Project Yu-Gi-Oh! World Championship 2011: Over The Nexus Enhanced

VoloTheDestroyer · Jul 15, 2026

Just thought I would share what I have been working on for quite a while on Yu-Gi-Oh World Championship 2011: Over the Nexus.

Latest Patch can always be found here: https://github.com/VoloOTN/over-the-nexus-enhanced/releases, please apply it to an unpatched EU rom. Due to the nature of the changes it is a bit of work to apply them to US and JP! Sorry!

Latest Patch v0.1.0
New Cards
These cards have been replaced to have new cards added to the game, please excuse any visual bugs, text bugs or genuine improperly functioning effects.

Minefieldriller -> Reborn Tengu
Vampiris Orchis -> XXS - Boggart
Deepdiver -> XXS - Dark Soul
Ancient Gear Cannon -> Mystic Piper
Destruction Jammer -> Infernity Barrier
Botanical Girl -> GK Recruiter
Synchron Explorer -> Tour Guide
Blackwing - Fane the Steel Chain -> Wattcobra
Dverg of the Nordic Alfer -> Karakuri Komachi Ninishi
Scarred Warrior -> T.G. Hyper Librarian
Basic Insect -> Metal Armored Bug
Thunder Dragon -> Thunder Sea Horse
Last Will -> W Nebula Meteorite
AoJ Cosmic Gateway -> Elder of the Six Samurai
Ally Mind -> T.G. Striker
Hitotsu-Me Giant -> T.G. Warwolf
Dash Warrior -> T.G. Rush Rhino

Card Changes
Some personal changes I have made

Vylon Element - Is now an IF instead of a WHEN
Regulus - Is part of the Phantom Beast Archetype
Assault Mode Activate -> Quick-Play Spell
Means of Infestation -> Quick-Play Spell
Infestation Wave -> Quick-Play Spell
Infestation Ripples -> Quick-Play Spell
Molten Zombie -> Is now a zombie
Andro Sphinx -> Lv 8
Sphinx Teleia -> Lv 8
Theinen the Great Sphinx -> Lv 8
Hypnocorn -> 1900 ATK
Ice Barrier Raiho -> Lv 5
Ive Barrier Grunard -> Lv 7
Archfiend's Roar -> Quick-Play Spell
UFOroid -> Lv 4
Gazelle the King of Mythical Beasts -> 1800 ATK, Light
Berformet -> Lv 4
Chimera, the Flying Mythical Beast -> Lv 5
Batteryman Charger -> Lv 4, 1300 ATK

Planned Changes:
n.b. That v0.1.0 includes no changes to CPU/Story decks. Or puzzles. You will just have the card changes and new cards in general

Update all CPU/Story mode decks to be less trash current progress 12/250ish...
Modify all duel reward minigame rewards to be representative of the duelist 0/120ish
Update the card_packs in general. Move some cards, shake some cards etc. 0/(∞)
Make some new puzzles. 1/10
MOAR CARDS

VoloTheDestroyer · Jul 21, 2026

Just to write a quick little update:

Since the release of v0.1.0 I have:

Fixed bug with T.Gs end-phase search effect triggering on any-leave instead of just destruction effects.
Changed Armory Arm to use the TCG ruling
Added Shooting Quasar Dragon - the multiple attacks have since been added since the production of the video.
Somewhat fixed most of the weird artifacts in the card art (remove the blocking and transparent colours)

VoloTheDestroyer · Jul 30, 2026

Bit of a slow week regarding progress on the rom. Spent most of the time making decks instead of adding new cards.

Frog and Alien/Uria players will be eating good.

NietonoNoShana · Aug 5, 2026

ABSOLUTELY INSANE WORK. The amount of times i wish 2011 had the same card list as tag force 6 (quasar, w nebula, infernity barrier etc). Looking forward to your future work!

VoloTheDestroyer · Aug 18, 2026

NietonoNoShana said:
ABSOLUTELY INSANE WORK. The amount of times i wish 2011 had the same card list as tag force 6 (quasar, w nebula, infernity barrier etc). Looking forward to your future work!

Thanks - Slowing making my way towards v1.0.0 but i have been distracted with other Over the Nexus related projects...

New cards:

micaelagonzalez · Sep 6, 2026

Wow, you're amazing!
Will it be possible in the future to add cards instead of replacing them?

VoloTheDestroyer · Sep 8, 2026

micaelagonzalez said:
Wow, you're amazing!
Will it be possible in the future to add cards instead of replacing them?

I think the best I can do is replace normal monsters that do not really have any attachments to other cards. I have also figured out how to convert Effect-less fusion monsters into Synchro monsters so we do not lose synchros. Adding distinctly new cards into the game is possibly doable but requires touching so many files that I wouldn't know the extent of how many files I would need to modify.

Anyway I have been a bit quiet lately here are some new cards:

More to come but that's all I am showing atm

Can you guess what is coming next

?

VoloTheDestroyer · Oct 5, 2026

Been relatively quiet:

Here a status update:

81 New cards (mostly replacing normal vanillas of effect-less fusion monsters)
Ability to toggle on/off banlist restrictions
All at Random card pack unlocked by default

Things I have figured out and I am trying to figure out how to work into the rom hack:

Extend the number of banlists available by default

30/249 decklist modified.

EM66 · Friday at 4:45 AM

Awesome! good work i wanna do the same but i dont know in what .bin edit the only think can do is edits the stats in card_prop.bin, can you help me please?

eyeliner · 2026-10-12T08:27:14+0100

This is an amazing achievement.
Well done.

Fixing the game while adding content, and dealing with all of that while keeping sanity is impressive.

VoloTheDestroyer · 2026-10-12T20:43:46+0100

EM66 said:
Awesome! good work i wanna do the same but i dont know in what .bin edit the only think can do is edits the stats in card_prop.bin, can you help me please?

Sure. The card effects are all coded in overlay0003, there are a bunch of tables which register card IDs into effect slots and then the effects are written in ASM.

What are you specifically trying to do?

eyeliner said:
This is an amazing achievement.
Well done.

Fixing the game while adding content, and dealing with all of that while keeping sanity is impressive.

Thanks. I definetly wouldn't call it "fixing" the game. I think I lost my sanity a while ago but I think the hack is in a good place now where as soon as I finish the CPU decks then I can get the darn thing out

eyeliner · 2026-10-12T21:47:27+0100

VoloTheDestroyer said:
Sure. The card effects are all coded in overlay0003, there are a bunch of tables which register card IDs into effect slots and then the effects are written in ASM.

What are you specifically trying to do?

Thanks. I definetly wouldn't call it "fixing" the game. I think I lost my sanity a while ago but I think the hack is in a good place now where as soon as I finish the CPU decks then I can get the darn thing out

I always think about one thing in these hacks:
Does the CPU actually engage in a strategy that incorporates the new cards added or, does it treat them like the one that was replaced?

VoloTheDestroyer · 2026-10-12T22:04:05+0100

Honestly it's hard to say. The AI is really simple and it is entirely based on whether or not anything can be activated or not - so it quite literally stumbles into activating cards.

If it's a trigger effect then the AI might just stumble into activating it. So the CPU can play Reborn Tengu because it'll happen to summon it and it will trigger in gameplay.

If it's an ignition effect then the AI will just not use it which is a shame. So most of the new cards I have been adding are mostly for the player to enjoy.

The deck edits I have been making have mostly been to bring things up to a faster pace (better cards, efficient cards, better ratios) so the AI feels stronger without actually "improving" the AI. I have put a couple of the new cards in some decks and I test whether or not the AI plays the new cards so it isn't a waste.

These decks changes coupled with making certain cards a bit more challenging to get in the early game should make the game feel harder than it currently is. And you shouldn't be able to coast through with just the starter deck

EM66 · 2026-10-13T02:09:15+0100

VoloTheDestroyer said:
Sure. The card effects are all coded in overlay0003, there are a bunch of tables which register card IDs into effect slots and then the effects are written in ASM.

What are you specifically trying to do?

Thanks. I definetly wouldn't call it "fixing" the game. I think I lost my sanity a while ago but I think the hack is in a good place now where as soon as I finish the CPU decks then I can get the darn thing out

Omg is located in THAT part!?

It was a nightmare for me to find where the effects actually happen; I used breakpoints like crazy, but since I hardly know anything about this (I'm just starting out), I didn't get anywhere. Tell me, do I need to look for the card ID in overlay9_0003? I can easily find the id of the card, so i want to know how manipulate easys effecto to start ,like what type of experimente i can do to know it !THANK FOR REPLY YOU ARE MY SAVIOR !

ROM Hack Project Yu-Gi-Oh! World Championship 2011: Over The Nexus Enhanced

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