Ever since Nintendo concealed a magic vine in World 2-1 on

But this memorable bonus content, much like everything worth your time in Woolly World, is only available if you choose to hunt it down. You don't need to collect a single hidden item on your journey from 1-1 to the final boss. Some would say that gives Woolly World its inherent accessibility, in that players aren't forced to take the hard road. But if you want to be fully entertained, the hard road is the only real option. It is your own degree of curiosity, and your compulsive nature, that will determine which route you'll take.