Super Mario 3D World Tutorial: How to get a secret 1up on World 1, Super Bell Hill. You'll need a cat bell for this trick. Go to the part of the map where there is a bridge-like walkway where there are cat-goombas and boxes. Look under it. You'll see to brick blocks. Press Y to break them with your cat suit. And their you have it. Your 1up supply has increased! Yeah this for another tutorial.