Switchblack Ruins

Switchblack Ruins, or , is the second course in the seventh world of Super Mario 3D World, World Castle. It becomes accessible by beating Fort Fire Bros, and its own completion unlocks Boiling Blue Bully Belt.

Green Stars

 * Green Star 1: In a circular room before the checkpoint, the player must use the Fire Flower to light all four torches to reveal the green star.
 * Green Star 2: Immediately after the checkpoint, the player must keep going right to find a hidden room with the green star.
 * Green Star 3: The third green star is behind the green Warp Pipe near the end of the level. The player needs to unveil an invisible rectangular ? Block to reach it.

Stamp

 * In the second volcanic room, the player has to jump to the rightmost platform to find the stamp.

Enemies

 * Spinies
 * Fire Piranha Plants