World Castle-2: Switchblack Ruins

Follow the path at the beginning of the stage until it bends. Get the power-up (Fire Flower) from the ?-Block.

Enter the big room filled with Switch Panels. Step on them to turn them from blue to yellow to proceed.

Continue through more hallways and another room with Switch Panels.

In the circular room with unlit braziers, light all four to earn the first Green Star. A Fire Flower is needed for this.

Proceed to the next hallway to find the Checkpoint Flag. Touch it and get a power-up from the ?-Block.

Before entering the next room with Switch Panels, look for a small tunnel on the right side. Enter it to find the second Green Star.

Enter the next Switch Panel room. It contains a Fire Piranha Plant on a moving platform in the middle.

When you reach the bridge over lava, take the platform to the right. Jump off on the right side to find the Stamp.

In the final room, you will find Switch Panels in the four corners, with enemies and moving platforms in the middle. If you have a Fire Flower, clear the room of enemies first to make activating the panels easier.

Once the panels are activated, a door will open leading to a green pipe. Do not take it immediately.

Behind the green pipe, along the wall, find a hidden ?-Block. Hit it.

Perform a Ground Pound jump from the hidden ?-Block to the alcove above it to find the third Green Star.

Now, go through the green pipe to reach the Goal Pole area.