DDD Splatoon

Step one: Obtain DDD and its server from https://github.com/dimok789/ddd/releases, and the HBL from https://github.com/dimok789/homebrew_launcher/releases.  Put the content from the HBL and DDD zips on your sd card (sd:/wiiu/apps/appfolder/app.elf), and put the server on your pc somewhere.

Step two: Go to the folder you have the server in, shift right click, and open a command window. Run ipconfig, and copy your ipv4 address.  Then run "titledumper /vol \foldername", where foldername is the name of the folder where you want to dump Splatoon.  You could also put a filepath here.

Step two (optional): Download HBL webserver files, and host those.  You don't need to do this because loadiine.ovh works fine.

Step three: Go to your Wii U and insert your sd card.  Get onto HBL using a kernel exploit (HBL Illuminati on loadiine.ovh).  Then run DDD.  Insert your pc's ipv4 adress and choose the option to go back to the home menu, or launch the disc if you have the disc version. Then launch Splatoon. If you did it right, Splatoon should hang on its loading screen and the titledumper cmd should start spewing words.  The dump will take a while, mine took two hours.  If auto powerdown is on, your Wii U might turn of in the middle of the dump, so keep that in mind.

Step 4: Once the dump seems to end, don't close titledumper and go to your Wii U and check it.  If Splatoon is on the homepage, press home and wait for about 1-2 minutes.  Then power off your Wii U.  You now have a dump of Splatoon!

If you repeat these steps for any other game, you'll pretty much get the same results.  However, some games, like Smash, are significantly bigger and take much longer.