Hidden parameters on existing sprites found thanks to No$GBA Debugger:

Sprite 277
Nybble 4 is actually the Layer priority.
It can accept values between 0 and F, a modulo 3 is applied.


Sprite 93
Nybble 9:
A positive value means the sprite will be shifted by X pixels to the right.
A negative value means the sprite will be shifted by X pixels to the left.
To get the actual value used by the game, multiply by 4096 (0×1000).


Nybble 10:
A positive value means the sprite will be shifted by X pixels up.
A negative value means the sprite will be shifted by X pixels down
To get the actual value used by the game, multiply by 4096 (0×1000).

Batch 3:

Sprite 28
Nybble 4: Behavior
0:Default,
4:Pipe generator,
2:Self-destructs (240 frames),
8:Self-destructs (241 frames)

Nybble 11: Pipe generator direction
0:Up,
1:Down,
2:Left,
3:Right



Sprite 34
Nybble 7: Switch mode
0:Do nothing,
1:P-Switch,
2:!-Switch,
4:Red Blocks only,
5:P-Switch + Red Blocks,
7:All

Nybble 8: Activation mode
0:During timer,
2:After timer



Sprite 37
Nybble 11: Cancelled out by the code, as far as I noticed.



Sprite 194
Nybble 11: Cancelled out by the code, as far as I noticed.


AFAIK this parameter was always like this since the 2nd revision.

Please have pity on that poor soul who only got 1 heart afterall…



Jokes aside, I already did number 3 on my hack before you even asked (actually it fixes pretty much everything wrong with the pipes), but I have yet to port it on the American version.

The only one that I did for now is number 4:
_Decompress overlay 10;
_Go to offset 0×4D35F (US) or 0×4A333 (EU);
_Change 1A into EA;
_Decompress overlay 54;
_Go to offset 0×BC6C (US) or 0×AF98 (EU);
_Change 0C00000A into 00000000;

What this does has nothing to do with the Texture effects, rather it changes the way a Scene is loaded from an Entrance.
Basically each time you take an Entrance the whole Area is reloaded no matter what, even if the Destination Area is the same as the Source Area.

It shouldn't have any incidence.

But can you give me an example of what you mean by cross-zone event?
I have my idea of what you mean but I want to make sure we're talking about the same thing.

Sh… sh…… shit!

Wow, the game actually managed to sucker punch me!
I got tricked because I tested with an Event ID of 8 or less, and it worked, but as soon as I tried an Event ID of 9 or above…


Oh well, testing time, I guess it's probably something simple like a CMP Rx,#8 or #9 along with the conditional branch to comment out.

Ah! Glad I'm not the only one who did that

Something I didn't try yet in practice, but in theory with this trick you should then be able to setup an ASM hack to dedicate one background, one foreground and one tileset for each of the 177 areas (or 176 if you're playing the US version).
And I dare say you can push this even further to make the game select even a background, foreground, tileset, Soundset, Spriteset per View located in one given Area (but it'll have to be changed dynamically as the game reload the Area)!



Since  skawo and I use slightly different tactics, here's how I do it:
1. Basically the same thing expect I used DSBuff instead, and you'll have to specify the folder where you want to extract the ROM.
2. The same.
3. From there it's different, what I do is that, in the extracted files from DSBuff, I create a new sub folder in the "data" folder that begins by "z" and place each of the new files there.
4. Be careful! The last file in the UiStudio folder will give you the last file ID used by the game, for some reason the game doesn't load the file ID who would numerically come immediately after this one (in EU version that would be file ID 2449), so this file must be empty.
5. Now you can pack the files into a new ROM with DSBuff.
6. Open your new ROM 1 with Tinke, and click Save ROM, this will bring the filesize to the next power of 2.
Oh! And Tinke won't let you save to an already existing ROM.
7. Open your new ROM 2 with NSMBe and extract the fnt.bin.
8. Open both the old and the new fnt in a Hex editor, what I do from there is that I copy the file info from the old fnt and paste it in the new fnt, there's no need to copy the folder info.

Basically you begin to select from ARC0.narc and all the way to the end of the file, then c/p to the new fnt beginning from ARCO.narc.
9. Open NSMBe, import the new fnt in the new ROM 2.
10. Close and re-open NSMBe, now the files should be in the correct order.
11. Select the root folder, click Replace and select the root folder you extracted earlier in step 2.
12. Test in DeSmuMe.
13. ???
14. Profit

Events won't get nuked anymore when reloading an Area, regardless of whether or not this Area is part of the current Level.

_ Decompress arm9
_ go to offset 0×1DEA8 (US) or 0×1E114 (EU) and change 020000E0 0E1001E0 by 00000000 00000000
_ go to offset 0×1DF00 (US) or 0×1E16C (EU) and change 020000E0 061001E0 by 00000000 00000000
_ go to offset 0×1DF34 (US) or 0×1E1A0 (EU) and change 0100C305 by 00000000

I needed those 2 mods because I'm using them as a complementary obstacle during the bosses fights of Worlds 6 and 7.

Kill Mini Bloopers spawned by the Blooper Nanny on Level Completion
_ decompress overlay 25
_ go to offset 0×50E0 (US) or 0×4CE4 (EU) and replace 23 by 22



Kill Flames spawned by Flame Chomp on Level Completion
_ decompress overlay 70
_ go to offset 0×18F8 (US) or 0×172C (EU) and replace 23 by 22

That in itself shouldn't be too difficult, but afterwards those would have to be checked too:
_ ground-pounding a slope or pressing Down when on a slope should still make Shell Mario roll downwards;
_ when Mario is already rolling, climbing a slope shouldn't slow him down nor make him go downwards;
_ not mandatory (and also I was thinking about this one for a while) but when under the effects of a Starman, rolling speed and running speed of Shell Mario should be made at ×2 of their original value.

Hmmm…
There was bound to be a problem when we both use different regions (EU for me and US for you).
And even if we used the same region, the Blue Shell code required me to use the space from 19C0 to 3000 in the arm9 to put the code.
Which means that most likely you would hook the code at a different address anyway.

I can still try to port the code from EU to US at offset 0×2800 in arm9, that way there won't be any conflict with an already existing code.

For the pipes it's going to be a lot harder though, since my code is, to be frank, quite a mess.

Whoa! You have me worried here. *sweats*

So I tested on a clean ROM this time, and it still works on my end, in fact I tested on my flashcard and everything's fine.
I made the xdelta for the US version if you want to test (on level 1-1 then) or if you want to take overlay 10 from it.

Blue Shell.xdelta

If that's what Thierry meant, then no it doesn't.
You don't even get to see the graphics due to this:


An easy way to check this is to replace the quicksand in the Map16 Editor by whatever graphics you want, and when you test in-game said graphics shouldn't even appear at all due to them being superseded by the texture.

The index was updated with several new tutorials:



ASM Hacks shop (in green), originally by  skawo:
http://nsmbhd.net/thread/2569-misc-patches-thread/


Adding custom 'bahp' points by  skawo:
http://nsmbhd.net/thread/3090-adding-custom-bahp-points/


Resize looped SWAVs by  skawo:
http://nsmbhd.net/thread/3221-resize-looped-swavs/


Adding files to the ROM by  skawo:
http://nsmbhd.net/thread/3253-adding-files-to-the-rom/


Background name table by  MeroMero:
http://nsmbhd.net/thread/3276-tilesets-and-backgrounds-name-table/


Make bottom background 51 use d_2d_W_M_back_jungle2_ncg.bin by  MeroMero:
http://nsmbhd.net/thread/3277-fix-bottom-background-in-slot-51/


Animate any background by  MeroMero:
http://nsmbhd.net/thread/3283-animate-any-background-tutorial/
Original thread by  Dirbaio:
http://nsmbhd.net/thread/1582-some-notes-on-background-hdma-scrolling-animations/

Blue Shell for Newer Super Mario Bros: (Take 2)

_Decompress arm9
_Paste this at offset 0×1A50



_Decompress overlay 10
At offset 0×44EFC replace 0B0B51E3 with 27C2FBEA
At offset 0×451F8 replace 000050E3 with 90C1FBEA
At offset 0×4534C replace 000050E3 with 5FC1FBEA
At offset 0×45594 replace 0B1BA0E3 with D2C0FBEA
At offset 0×46008 replace 000050E3 with F0BDFBEA
At offset 0×46294 replace 000050E3 with 55BDFBEA
At offset 0×49A34 replace 0B0B50E3 with 75AFFBEA


*crosses fingers*
Was tested on a flashcard for good measures, hopefully this time it works.

It's not directed at you skawo, or anyone else for that matter but…
FUCKING HELL!

Somehow, skawo, you must have earned the wrath of the ASM god or something…


Somewhere in the Blue Shell code I did a function to read directly the player's input to see if it's equal to D-Pad Down.
I know you're much more careful than that but please, tell me it's because you have cheat codes enabled for faster testing and that it interferes with the Blue Shell code… Please… Cognitive drought is really a bitch…

Putting aside the Blue Shell for the time being.



Mini Mario behaves correctly under low gravity

_Decompress arm9

US
_Paste this at offset 0×1BE0


EU
_Paste this at offset 0×23B0




_Decompress Overlay 10

US
_Go to offset 0×3A234 and replace DC1AD1E1 with B1EDFBEA

EU
_Go to offset 0×37648 and replace D815D1E1 with 80B2FBEA

Forget this, if you try to press down or ground-pound the Rope, it will be treated as a slope… oopsie
Sorry for the inconvenience I caused , refer to this post if you want the real solution.

OP updated with 3 new guides:

Collision Info Viewer by Ninjifox and Powerline, really useful if you want to check the hitboxes:
http://nsmbhd.net/thread/1664-nsmbds-collision-info-viewer-by-powerline-and-treeki/

How to fix the 'File is already being edited' error in NSMB editor by Thierry:
http://nsmbhd.net/thread/3250-fixing-already-opened-files-tutorial/

Massive information release on Worldmaps by  ray and  Freeze:
http://nsmbhd.net/thread/3422-literally-everything-you-need-to-know-about-worldmap-editing/

Hopefully

Well… indeed the issue was the entrance order, Entrance ID 5 was on Entrance row 4 but when reloading the area the 04 that was written was then interpreted as an Entrance ID instead of the Entrance row, hence the problem.

The placeholder entrance row is now written at offset 0×20CA8FE instead, which should prevent the issue altogether.
Also added a new small check for the Connected Pipe ID which reads the Connected pipe flag to prevent a hypothetical issue with the Connected Pipe ID trick to load any Area.

Added.

Also added 2 more guides:

How to edit the boot screen by  skawo:
http://nsmbhd.net/thread/3331-editing-the-boot-screen/

How to make a 8bpp title screen logo by  MeroMero:
http://nsmbhd.net/thread/3468-title-logo-with-256-colors/