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How do I use the website with my Wii U?
Unfortunately there is currently no easy solution for Wii U. However you can export your Super Mario Maker save file with the Homebrew app Saviine.
You can then use Cemu SMMDB to edit your save save file and reimport it to your Wii U with the Homebrew app Loadiine.
How do I use the website with my 3DS?
You need Homebrew on your 3DS. You also need the Homebrew app OCDM. We also recommend using Multidownload++ for simple QR Code downloads.

To import courses you can simply use your 3DS to scan the QR Code provided for every course. OCDM can then import courses from your SD Card.
Exporting is also done with OCDM. Exported courses can be easily uploaded on the website, but you would need to transfer your exported course to an external device, because the website does not support the in-built 3DS web browser. You can then just upload the raw file without wrapping it in a compressed format.
How do I use the website with Cemu?
Just download Cemu SMMDB, open it and select your Super Mario Maker save folder. It is contained in your Cemu folder under \mlc01\emulatorSave\#saveID#. You get your saveID by starting Super Mario Maker with Cemu. It is then displayed on the bordered window, but typically it is 44fc5929.
Downloading with Cemu SMMDB is self explaining. To upload a course you would have to navigate to your Super Mario Maker save folder and compress the respective course folder (named course###) in any compressible format.

If you prefer a video, one of our users made a tutorial.
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