From the Super Mario Wiki
Bob-ombs Below, also known as World 5-5, is the fifth course in World 5 from Super Mario 3D World. The level is unlocked by clearing Sprawling Savanna, and its own completion unlocks Searchlight Sneak.
This level starts in an underground area inhabited by some Bob-ombs and Piranha Plants. After passing a Fire Piranha Plant and some moving platforms, the player reaches the Checkpoint Flag which is followed by some more enemies and moving platforms, with a Cloud Cannon nearby. After navigating past some more enemies and a Dash Panel, the player reaches a pipe which leads them to a platform with a Bob-omb and the Goal Pole.
After the second Green Star, the player must destroy the cracked wall to reveal a hidden passage to the stamp.
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