Board Thread:Questions?/@comment-26842324-20150325000008/@comment-24495139-20150325015050

There are a couple engines that are easily portable to the Wii U eShop, most notably Unity, but there are others like Construct 2. Nintendo also has their own engine for html5 stuff called Nintendo Web Framework. I'm not sure if GameMaker is supported though.

But before you can get approved for eShop, you need to register either on Warioworld.com (this is for more skilled development ) or https://wiiu-developers.nintendo.com/ (this is for html5 and simpler Unity games). if you get approved, Nintendo may loan you a dev kit for a year (otherwise it costs like at least $10,000).

Then, after signing NDA, you can attempt to get your game through lotcheck and get it rated by the ESRB and finally get the game on the eShop. Though Nintendo's lotcheck is kind of strict for bugs.