It’s available for free.
Ubisoft has announced that Wii U owners can now download Rayman Legends Challenges App on eShop. It will be available for free.
The full game will be available on the PS3, Xbox 360 and Wii U on August 27th in NA and on August 30th in Europe.
“The Wii U exclusive Online Challenges App is a totally free application containing the Online Challenges Mode of Rayman Legends. In this game mode players will find updated Daily and Weekly Challenges to compete online with their friends and players from all around the world!”
They have also detailed the features of the mode which you can check out below.