Remaining 20% are touchscreen based levels, thought for cooperative gameplay.
These Murfy levels can be played in single player, AI taking care of Rayman, but they are optional and not mandatory to progress in the main story.
The game will include leaderboards for each level, so that we can challenge miiverse friends.
These are the main new informations from this Gamekult interview with the lead game designer:
http://www.gamekult.com/actu/pgw-ray...o-A105618.html