I know Py_Hacker already asked something like this but... I wanna make the Jungle castle and a custom tileset for it. Heres the differrent part: I was woundering if I could make a giant Venus Fire Trap replaceing the W2 Mummy Poky boss, I also have a idea for the spiders in W8 (Scuttle Bugs I think) if noone is planning on useing them and I can find the file.

Go ahead, if it's cool and works well it'll be included.

If someone else wants to use the unmodified version of these sprites, it IS possible to use different versions of the same file in different levels with some ASM hacking.

Ok thanks! If I do edit the Scuttle Bugs then Im gonna try to make them... Mounty Moles! Yay!
Also: That gives me a idea for the final castle... Mabey I could make a inside then you beat bowser THEN (Checkpoint) you go up to the roof and a Lakitu (Remade as B Jr in a Clow Car) throws Mecha Koopas at you THEN you need to fight him (Remade Lakithunder) THEN AGGGAIN you fight his dad (Who is giant beacuse every NSMB needs that)
EDIT: Or mabey in a robot suit

Remember the limitations of bosses there .

Yeah, that too.
Sounds like most of stuff you want to do isn't possible. Or not easy, at least.

But well, I won't stop you from trying...

Couldn't you use that to send a unmodified arm9.bin and header.bin so that DS Download play will always work? (On every flashcart)
Is that already in the editor's Download Play ASM hack?

arm9.bin doesn't have a file ID, it's not a regular file. So no.
also this is offtopic.

Oh right... I forgot mabey it can be something kinda different