Here is an idea for playing with people online on wii games that don't have an online mode (like nsmbw), without using homebrew or any other modification to the wii. It uses a PC and the internet to send button presses and bluetooth to act as a fake wiimote.

Here is an explanation:

NSMBW player 1 wiimote button presses 2.
Computer Bluetooth picks up button press.
Sends to other computer.
Other computer bluetooth pretends to be player 1 wiimote on other wii.
Mario jumps.
And vice versa.

You set it up with a program or website on the computer.

What do you think of it?

This sounds cool.
I wonder if its possible?
But how will the other player would see the screen?
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They would see there own tv screen, why would that be a problem?

Never mind. Didn't think about it. I thought you mean using only 1 wii. But how will the synch between system would work?
Also, wouldn't it lag a little bit? Some parts of the game require quick moves.
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Well online on the wii works with games that have a mode for it don't they?

But does NSMBW has an online mode? No it doesn't.

I actually don't get it at all
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Well, most multiplayer games work like that. They send each other's input (the key presses) to the other machine, and both run the game with the same input, so both consoles stay in sync.

The problem is that, when doing this over the internet, there's LAG. Let's say you have 80 ms of lag. One frame at 60fps is 16.6 ms, so 80ms is like 5 frames. So your actions lag 5 frames for the other player and the other player's actions lag 5 frames for you. It's just impossible to maintain the two consoles in sync this way.

DS games like NSMB and MKDS do this in local wifi multiplayer. The thing is that both consoles wait for the other console to send the keypresses before advancing the game one frame, so they're always in sync. This is why the game lags if there are interferences in the signal.

Also this is why the game goes out of sync if players use different ROMs, or one has cheats enabled, or whatever. This is why it's not possible to cheat in local wifi games.

It's not possible to do multiplayer that way over the internet, there's too much latency. For example, MKDS does the keypress thing while playing locally, but does the shitty "send kart positions, update enemy's positions" stuff. That's why it's possible to cheat in WFC MKDS.
So, yea, getting this to work without no modding at all is rly hard

So the reason things like Mario Kart Wii work is because they sync to each other by waiting and by updating positions.

And the reason this won't work is because the game needs to have a mode built specifically for it?

The reason this won't work is that you need to sync the game's input frame-by-frame. DS games do that, they wait to receive the input from the other console before advancing one frame.

And doing this without modding is not possible. And even if we did it, it'd be too slow because of internet latency

OK so you would have to basically make a wifi mode from scratch in nsmbw with asm for it to be playable (not slow).

Yes
And I dunno if it's actually possible. Games like Mario Kart work well on Wifi because there's not much direct interaction between players, but NSMB games have lots of detailed close interaction between the players, so I'm not sure...

you should try to hacka nsmb2 copy, for the fact that maybe you can take part of the multiplayer coding and use it for the wii

OMG that's a really nice idea you got there! What are we doing here, hacking NSMB DS?!
We can get all the code from NSMBW (Treeki has it all) and then the DS will be basically a portable Wii! Neat

What would we do with the 2nd screen though?

thats not what i ment
i ment like to put the 3ds copy into a ds game ripper and rip the code and hack it for wifi and then play off the wii with patches

Problem is that the 3DS is still not hacked, so the rom of nsmb2 will be heavily encrypted, being impossible to get to the code at all
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Well, that's not a big problem, we could get the FBI and the NSA (and of course Dirbaio Enterprises too) to help us cracking the encryption key.

Then, once we have it unencrypted, we'll hire a bunch of monkeys, teach them both ARM asm and PPC asm, and have them convert NSMB2 to run on Wii (so you get what you wanted,  yoshimario!)

Of course we'll still need the Sony PGX54641FQ adapter, but as  Arisotura said, it's a nice piece of hardware that does its job perfectly. That should allow us to play NSMB2 nultiplayer over the internet on the Wii.

Wait, does NSMB2 support playing multiplayer over the internet?