World 2 (Super Mario 3D Land)
From the Super Mario Wiki, the Mario encyclopedia
World 2 is the second world explored in Super Mario 3D Land. This world is a yellow field with many blocks, hills and a mountain can be seen in the background. It has five levels, a Mystery Box, and a Toad House. The boss of this world is Boom Boom.
The four possible contents of this world's Mystery Box are: