I'll add that you don't need to be rude and bump dead threads to demand a download.

I'm closing this until further notice.

ah yes, that's definitely what he said.

you aren't going to "find" a multiplayer code. it's not just lying out there up for grabs.
oh by the way, please stop using google translate to make up for your lack of proper english. this hinders communication through frequent mistranslation.

did you replace the music? if not, that means you simply need to replace the sound set (found in the area settings) to something appropriate for the sprites in your level. it needs a bit of a cleanup, but we do have a wiki page that covers the numerous sound sets.

when you don't know what element of your level causes a crash, one thing you can try is making a copy of your level somewhere else and remove sprites 5 by 5 or so until it does not crash anymore. at that point, you've found the culprit.

if the issue has to do with entrances or something else, simply check them once you're done wiping your level clean. no matter how you do it, keep a backup of your level before the wipe.

most likely, something's wrong with your ROM. what NSMBe does when you open a ROM is firstly detect if it's a NSMB ROM via checking the signature in the header (which can be easily modified) and only show the "Level editor" part if it matches that of a NSMB ROM.

What you can do is check if the signature matches yourself.

Open your ROM and navigate to the ROM File Browser tab. From there, click the header.bin file and open it with the "Hex edit" button shown in the screenshot above.


Once that's done, this window will open. Please check whether or not the signature highlighted in the screenshot matches. If it doesn't, please provide us with a screenshot if you can.

The next paragraph may be a bit complex, so do not hesitate to ask if there's something you do not understand.

I recommend that you do not correct the signature within NSMBe if it does not match. Overwriting the header with NSMBe seems to have adverse effects so I'd recommend using an external hex editor for that. Once you've found signature within NSMBe (which in my case is "NEW MARIO...A2DE01") you can search that within the ROM using an external hex editor.

I'll make a more in-depth tutorial on this later, but the gist of this issue is that certain backgrounds have animations attached to them.
These animations are used extensively for world 8 backgrounds to simulate glowing or flowing lava, as seen here.



Here are the rough technical details.
Each background is made out of a small palette of 8x8 tiles (each exactly 8 pixels in width) that are then arranged on a canvas to build the background. Some of these tiles have an animation attached to them which cannot be removed as far as we know. It may be hardcoded, or there may be a reference file for each background. I don't know if anyone looked into this.

Now. When importing backgrounds, NSMBe's algorithm fills the tiles however it pleases in an attempt to output the objective "best result" using the limited tile palette it has to assemble the background. As the palette is tiny, it will merge any tiles that look similar enough in an effort to avoid having near-duplicate and therefore save tiles. It will keep doing this until the palette it needs to build the background is tiny enough to fit into the limited palette the game uses.

NSMBe has no awareness of animated tiles however and makes no effort to avoid using them, which leads to problems as animated tiles end up littered across the resulting background.

In some cases, this can be avoided. For example in the case of the "Volcano 2" TOP background, the animated tiles are situated at the last row of tiles, as highlighted in purple here:



If you reduce the number of tiles necessarily to assemble the background, NSMBe does not need to fill up the entire palette and will leave these tiles blank. Here's an example of a background I modified prior to importing which achieves just that.



Notice how the clouds are very repetitive and how there's only one volcano repeated over and over, as opposed to several of them. This is to save as many tiles as possible in an attempt to free much of the last row of tiles.


Unfortunately, the animated tiles for the Volcano 3 TOP background seem to be located earlier in the palette, thus making it hard to use any of the subsequent tiles using the same method.


You can still use this slot if you can whittle down the required tiles to within the 208 tiles that precede it, but that's a tough task unless you prepare your background optimally.

I advise you use another background slot instead. It's tough since there's a limited amount of them, but you can always use this slot for a simpler background somewhere down the line.

That does not solve the issue that you then have to rearrange the resulting background like a puzzle which can be complicated, and if you don't have free tiles you're going to be missing tiles one way or another.

Oh, I figured you were talking about the tiles from the palette itself, my bad.

To answer your question, yes you can theoretically do that but beware that the way these animated tiles work is particularly wonky due to the amount of hardcoded stuff related to backgrounds and it likely will glitch out if you pair certain top backgrounds with specific bottom backgrounds for some.. reason. All I know is that this wasn't made with flexibility in mind, much less modding.

Foreground bg, background bg, and tileset all influence eachother in some way, this much has been made evident by years of messing with them.

Also, in my testing Volcano 3 seemed to use Volcano 2's animations. You'll have to do your own testing because it might be different for you.

Due to them being incompatible, you cannot hotswap models between both games.

If you wanted to play as Wario, you can download this mod.
Otherwise, you'll have to follow this advanced tutorial to import models in NSMB. Note that if you want to use SM64DS models, you'll have to extract them from that game first or get them from here.

This won't be easy if you're new to ROMhacking, so by all means good luck.