World 7-3 (Super Mario 3D Land)
From the Super Mario Wiki
Seventy Star Medals are needed to unlock this level. In a dark tree level based on tightropes, Mario needs to navigate up a tree by tightropes while avoiding Fuzzies then jump in a warp box to get to another tree and do the same. After he hop into the next warp box, Mario is taken to the third and final tree. The player needs to avoid Fuzzies and reach to the flagpole. However, a huge shortcut requiring Tanooki Mario or Statue Mario is present in the stage.