Requirements:
WiiScrubber v1.40;
nfs2iso2nfs v0.5.4; it may require the Wii common Key. You can use wiiscrubber's key.bin renamed to wii_common_key.bin.
A clean rip of your Wii game;
The extracted contents of a Wii VC title for the Wii U (except the .nfs files);
-the 2 below require java to be installed-
jnustool (requires Wii U common key so you'll have to search online - hint: it begins with D7B0. Open the "config" file in notepad and paste the key inside, replacing [COMMONKEY]);
NUSpacker (must be @ihaveamac's version, requires Wii U common key as well)

Current limitations:
It's possible to use the gamepad to emulate ONLY the Classic Controller.
Wii Remote emulation is possible but there's no gyroscope or infrared commands (at least for now).
(Input emulation patches by @FIX94)

The game must be already compatible with the Classic Controller but that isn't a guarantee that it's going to work.
Here's a compatibility list: http://wiki.gbatemp.net/wiki/WiiU_VC_Wii_inject_compatibility_list

Integrity checks are still in place so only clean disc rips work.
The game iso must be pristine: untrimmed, unscrubbed and the partitions signed.
No homebrew, no mods, no wimmfi patched games until sigpatches are implemented.
Patched isos work now! Original idea by @Tock46!

Homebrew works now, even a special version of Nintendont by @FIX94

Trimmed isos still don't work, at least not isos trimmed by WiiScrubber.



HOW TO DO IT


0. Downloading a Wii VC Title
This may be illegal and I'm just telling you so you don't ever do it by mistake OK?
You can use the command line to download games' contents directly if you know the title id and title key.
I heard you can get them on a certain titlekeys site...

Once you have that, this is the command

java -jar JNUSTool.jar TITLEID TITLEKEY

Note: You should get a game that contains the latest revision of fw.img (r590), that's the only version supported by @FIX94's patches.
Here's some info you can use to verify that you have a good file:
Size: 1785497 bytes.
CRC32: E2F27E9B
MD5: 3CAF52A9A440EEE4F125A3AD22E305C8
SHA: A5A75EBF3164874830A1D5992495DE510AB3F74E

Now here's a list of some titles that contain the preferred fw.img (verified mostly by @fejich and @markehmus)
DONKEY KONG JUNGLE BEAT [VBXE01]
Kirby's Epic Yarn [VARE01]
Lost in Shadow [VA8E01]
Mario Strikers Charged [VBFE01]
Mario Super Sluggers [VBHE01]
Pandora's Tower [VAPE01]
PIKMIN 2 [VBTE01]
PIKMIN [VBUE01]
Resident Evil 4 Wii Edition [VBDE01]
Resident Evil The Umbrella Chronicles [VBWE01]
Rhythm Heaven Fever [VAKE01]
Sin and Punishment Star Successor [VALE01]
Super Mario Galaxy [VBKJ01]
Super Paper Mario [VBBE01]
The Legend of Zelda Skyward Sword [VANE01]
Trauma Team [VA6E01]
Wario Land Shake It [VBGE01]
WARIO WARE SMOOTH MOVES [VBVE01]





-----------------------------------------------

1. WiiScrubber
First setup WiiScrubber. Remember it needs the Wii common keys so run MakeKeyBin.exe first and do as it says.
Run it and open you iso. Right-click the UPDATE partition and select "Delete partition". Confirm.

Now click on the + box to expand the DATA partition, then expand partition.bin.
Right click tmd.bin, select "Extract" and save it.
Do the same with ticket.bin.

Rename the extracted ticket.bin to rvlt.tik
Rename the extracted tmd.bin to rvlt.tmd

Copy/move both files to the "code" folder of the Wii VC title.

Your iso is now ready and you can close WiiScrubber.


2. nfs2iso2nfs
Move your iso to the "content" folder of the Wii VC. Rename the file to "game.iso".
The content folder should contain only game.iso and the "assets" folder. Delete any nfs files that are still present.

Copy nfs2iso2nfs.exe to the content folder and run it. If everything is in place, it will begin the conversion process.
It should take around 15 minutes. Its console window will close when it's finished.
Once it ends you can delete your iso file and nfs2iso2nfs.exe (and wii_common_key.bin if it exists).
The content folder should contain only the nfs files and the "assets" folder.

Optional: You can enable Classic Controller emulation for playing using only the gamepad.
Open meta.xml (it's in the meta folder) in notepad.
Look for the line

<drc_use type="unsignedInt" length="4">1</drc_use>

replace it with

<drc_use type="unsignedInt" length="4">65537</drc_use>

and save the file.
Note that this will only work if the game supports the Classic Controller.
If it doesn't either it won't boot or you won't be able to do anything and only the gamepad's power button will work.
Here's a list of such games: https://wiki.gbatemp.net/wiki/List_of_Wii_games_compatible_with_Classic_Controller


3.NUSpacker
The final part, building the installation files.
NUSpacker requires the Wii U common key. You should find it online and then open the file "encryptKeyWith" with
notepad and paste the key inside (hint: it begins with D7B0)

It's also a command line tool so you'll have to write down the commands, or simply create a new text file,
write the command inside, save it and change the extension from .txt to .bat

I recommend copying the Wii VC folder (that contains the other 3 folders, code, content and meta) to nuspacker's folder.
That will make everything easier.

The command works like this (replace with the names of your own folders)
If you folders have spaces in their names, enclose them in quotation marks, like "Just Dance".

java -jar nuspacker.jar -in GAME_FOLDER -out INSTALATION_FILES_FOLDER

Wiait until it finishes the process.
Now just copy the folder with the installation data to the "install" folder SD card, run a CFW and install it with WUP Installer GX2!

PS: If you make a nonfunctional game, remember to uninstall it before trying again.
If you install a fiunctional game over a broken installation, it will still appear as broken.

 

[ShadowOne333]

Added.

Thank you

Super Mario galaxy 2 was the euro version I injected into and I've used USA ISO for all injects. I've noticed myself using euro ISO that has given me errors. Errors being that the tool spits out install files larger than 4gb so unable to transfer to fat32 card. These errors may not be because of euro ISO could just be a bad ISO dump so decided to just use USA iso's

Okay so Super Mario Galaxy (EUR) was the base VC and all of the injected ISOs you have in that pic are all USA, right?
Gonna start adding them, thanks for the feedback!

@Columbo2811 added all of the games you posted to the List
It's starting to look quite decent now for a Compatibility List made yesterday

 

[absinthee]

You need to make an account I believe.
But if you want to I can add it for you.

Here's the list I've succeeded with. I used DKCR as my base game for all of them. All games are U region.

New Super Mario Bros. 3+ (mod) - no CC support
MadWorld - no CC support
Rodea The Sky Soldier - no CC support
Link's Crossbow Training - no CC support

Thanks!

 

[ShadowOne333]

Here's the list I've succeeded with. I used DKCR as my base game for all of them. All games are U region.

New Super Mario Bros. 3+ (mod) - no CC support
MadWorld - no CC support
Rodea The Sky Soldier - no CC support
Link's Crossbow Training - no CC support

Thanks!

Added. Thanks!

 

[Frgatso]

Smackdown vs. Raw 2008 works with the Xenoblade base(no cc support).

 

[OkazakiTheOtaku]

Smackdown vs. Raw 2008 works with the Xenoblade base(no cc support).

So I've read through this entire thread, and something has been on my mind.

Disregarding the Gamepad support, does it even matter what base you use?
Because it seems like no matter what game is injected into what base (again, ignoring Gamepad support) it doesn't matter.

 

[ShadowOne333]

So I've read through this entire thread, and something has been on my mind.

Disregarding the Gamepad support, does it even matter what base you use?
Because it seems like no matter what game is injected into what base (again, ignoring Gamepad support) it doesn't matter.

I don't think so.
@piratesephiroth said that so far there were like only 2 versions of the fw.img.
Although I don't know which Wii VC games have which, or which one of the two is the most recent one.
Afaik, there shouldn't be any difference when trying out the Gamepad support, or trying out injections in general.
Then again, I'm not 100% sure, so only he can tell for sure.

 

[ootnes2]

Last Story U (Xenoblade base) [Gamepad + Generally don't need to resync for gamepad off-tv]
Kirby's Dream Collection U (Xenoblade base) [Gamepad, not all challenge stages tested]

 

[Columbo2811]

@ShadowOne333 thanks for adding those to the list, just spotted you've put dirt 2 down as don't support gamepad but it does. The controls can be reconfigured too if anyone is interested cause by default it uses acceleration as R and brake with L which isn't comfortable using the gamepad but controls can be changed to A+B for accelerating and braking.

 

[absinthee]

Maybe this is already known, but I've found that changing the last letter of the title id and group id in the xml files to a letter between G-Z (English alphabet) causes the game to be read as an update or dlc. Everything still seems to work normal when using letters between A-F.

WUP Installer will not install the game if it thinks it's an update or dlc.

 

[victormr21]

Maybe this is already known, but I've found that changing the last letter of the title id and group id in the xml files to a letter between G-Z (English alphabet) causes the game to be read as an update or dlc. Everything still seems to work normal when using letters between A-F.

WUP Installer will not install the game if it thinks it's an update or dlc.

Curious, I thought it only accepted HEX 0-F

 

[absinthee]

Curious, I thought it only accepted HEX 0-F

Not sure. I was just playing around with IDs and that was one of the results.

 

[markehmus]

There's no tutorial.
All you need to do is simply go to the starting letter of the game name you want to add.
For example R for Resident Evil, click on the "Edit" link and then simply add the information based on the Template which is at the beginning of the page:

{{ WiiU VC Wii Inject | name = ... | region = USA/EUR/JAP | host = WiiU VC | gamepad = Doesn't Work/Works/Issues | status = Doesn't Work/Works/Issues | notes = Please add a note if needed}}

You add that in between these in case there is nothing in the letter you have selected:

{{ Table Start/WiiU VC Wii Inject }}

{{ Table End }}

Or simply add what's in the code box if there are more entries already.

No place to create an account and so no 'edit' appears

 

[cucholix]

The Tatsunoko vs Capcom entry in the wiki mentions that the game works with gamepad, though it's unplayable because during fights it recognize the Wiimote held horizontal thus the controller is inverted, no mention that pressing HOME during fights require pointer, otherwise you get stuck @ShadowOne333

 

[Columbo2811]

The Tatsunoko vs Capcom entry in the wiki mentions that the game works with gamepad, though it's unplayable because during fights it recognize the Wiimote held horizontal thus the controller is inverted, no mention that pressing HOME during fights require pointer, otherwise you get stuck @ShadowOne333

Works fine here mate. Just tried it now to make sure and inputs are working correctly

 

[wicksand420]

@ShadowOne333 did you say before that Fire Emblem Radiant Dawn doesn't work?

 

[bennyman123abc]

SINCE WHEN HAS THIS BEEN POSSIBLE?!?!?

 

[cucholix]

Works fine here mate. Just tried it now to make sure and inputs are working correctly

Weird, during menu it set the wiimote vertical and you can navigate just fine, then in the character selection screen it changes to horizontal held and the d-pad is inverted. You have pal Tatsunoko? Or only the base?

Also did you use stock fw.img or patched one?

 

[Columbo2811]

Weird, during menu it set the wiimote vertical and you can navigate just fine, then in the character selection screen it changes to horizontal held and the d-pad is inverted. You have pal Tatsunoko? Or only the base?

Wierd. I've just recorded a video

 

[cucholix]

Wierd. I've just recorded a video

You used patched fw.img?

 

[Columbo2811]

You used patched firmware?

Yep. Used version 4 of nfs2iso2nfs which patches automatically