Build your own Mario level wallpaper for computer and phone

[tpex]

http://mariomaker-wp.nintendo.co.jp/

A few notes, since it's in Japanese:

Click the red button, then select the device type and resolution (the red star should show your resolution).
Clicking the rocket deletes everything (A pop-up box will appear - the right button confirms and the left button cancels.
You can drag some stuff onto others to create unique combinations. Try giving a mushroom to some enemies.

Translation thanks to zellisgoatbond on Reddit

[Tom]

[MENTION=261]tpex[/MENTION] this is awesome! Thanks for the share!

[tpex]

Glad to hear Tom

Oh and on Saving

You have to click on the icon with the grey robot, right below the area where you built the wallpaper.