Board Thread:News and Announcements/@comment-25404524-20171206094918/@comment-27661991-20171206194201

Levi.wiseman wrote: Demeyes -- I see the goal of monster to level 20, but how do you do it? My monsters still won't let me feed past 15.

You'll have to update the game. If your phone hasn't alerted you to an update being available yet, just go to the store, find MSM, and you should be able to update from there.