Bosses - All bosses now function correctly with 2 players. Defeat them together!

World Map - Play every single level on every single World with a friend!

Respawning - Players can now respawn if the other player is still alive. Simply press A while dead to join back in! (Disabled during boss fights).

Shared Coins - Players can collect 100 coins to both earn a 1-up.

Separate Lives - Mario & Luigi now have separate lives.

Updated Collisions - Players can walk through each other.

2 Player Support - All mechanics that grant players rewards such as Red Coins and Toad Houses now grant both players rewards.

Many other tweaks & fixes!

How to play:

1). Download the patch here (v1.01).
2). Apply the patch to a clean US rom of New Super Mario Bros .DS.
3). Launch the game on 2 DS's and both select the same save file.
4). Connect with the other player.
5). Play!


Potential Issues:

Desyncs - Occasionally, the game can desync. Although the game has been tested and every level has been played multiple times, it is possible not all desyncs have been found. If you experience a desync, please post where it occurred so it can be fixed for future updates.
Reloading to the last save will resolve the desync in most cases. If saving occurred during the desync, the save file may become unplayable.

Minor Issues:

Slowdowns/Lag - The game can slowdown at certain levels. Levels were not edited when possible to ensure the game is as close to the original Single Player mode as possible. Staying close to the other player can reduce slowdowns.

No Mario VS Luigi mode - This mode is unavailable in this hack.

Missing Sound Effects - Some minor sound effects are missing occasionally.

Missing Sprites - A handful of sprites are missing due to incompatibility issues with Multiplayer.

FAQ:

Does this work on Flashcart/Android/TWiLight/MelonDS etc.? - Any software/program that can load a .nds file is capable of loading the game but the system/emulator needs to be able to connect to another player.
This means the game can only be played on a real DS (through a Flashcart, TWiLightMenu etc.) or on an emulator that is capable of emulating wireless (MelonDS is the only DS emulator capable of this).

Does this work on a US copy of NSMBDS? - This only works on a US copy.

How do I get to World 4/7? - Beat the boss on World 2/5 while both players are mini.

Special Thanks:

 TheGameratorT - Helping me debug and figure out a ton of the multiplayer functionality, particularly with the World Map. This hack would not have been possible without his help so make sure to check out his work!

Ed_IT - Answering general hacking questions & providing updated hacking tools.

 KingYoshi +  Ndymario - Beta testing early versions of the hack.

 Arisotura - MelonDS made testing and debugging so much easier. Amazing emulator.

Nice, even more progress with VS mode hacking!

Are you going to post the source code. All these changes sound interesting.

You can just put 2 invisible solid tiles near the flagpole to prevent someone with mega mushroom desyncing the game (thats what i did in my nsmb race mode experiment hack)

Eventually.

It's quite messy and unfinished at the moment but once I clean it up, I'll release it.



True, but then those tiles can get in the player's way.

I'll look into that. It's pretty much impossible to get a mega mushroom outside of the first level anyways.

It is actually pretty easy to reach the flagpole with the mega mushroom as seen here: https://youtu.be/IX_rRIHRY0E

also, you could place the tiles here, it "never" gets on the way of the player without mega: https://prnt.sc/i6gixu

It will be fixed for the next update.

Do you plan to fix the SP bosses to work in mvl? instead of being limited to just Goomboss and Bowser Jr.

EDIT: Im not able to patch the rom, i already tried 2 variations of NSMB USA rom and none did work.

Probably not. From what I remember, around half of the bosses work and I have no clue how to get the others to work.

Also my bad, I messed up the patch somehow. It should work now.

Maybe skawo/newluigidev could help you on an asm to fix them. Do you have discord?

EDIT: crash report 1-2: https://youtu.be/FTAv8UicmSo

Thanks for the find, will be fixed for the next update.

how can you play mutltiplayer if you cant use dlp

If both ds systems run the same rom.
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GitHub - Kuribo64 - YouTube

Oooooh I forgot lmao sry

Very interesting! There's no way I can setup this with my current materials (much less find someone else to co-op with) but this looks like a huge step in hacking! Cool!

Maybe one day, there'll be a hack that works with dlp.

Although, is it just me or are the images broken?

DLP hacking already is possible. it's just much more limited.
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Nothing to say, so jadnjkfmnjamnfjkldnajfnjkanfjdksan jsdnvj m.

Theoretically, using the ASM he used, it’s only a matter of making the game load all the LvLs. But I don’t fully understand the code so uhh yea lol
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Here's my MvL Hacking thread

Consider joining the NSMB DS Hacking Discord Server! Also, be sure to check out the new wiki!

#HakingNoMore

well this looks interesting