Board Thread:Questions and Answers/@comment-26390896-20160522182506/@comment-28169049-20160526010406

one thing i can tell you is, if you buy the wubbox, breed all new monsters(that you haven't leveled up) to fill it up. you can put unfeed level 1 monsters in there and it works just the same. same goes for the rare wubbox.

i made the mistake of filling my wubbox with level 15 monsters on plant, then had to go back to breed them all over again, then had to feed them to level 15 again. it was a total waste of time and food points.