Our Shifty Boo Mansion stars guide details every Green Star in World 3-1 in our Super Mario 3D World stars walkthrough.
World 3-3 contains three Green Stars and a single Stamp to collect. If you’re looking for other Green Stars or stamps from World 3, as well as any Cat Shines from Bowser’s Fury, head on over to these pages:
| Green Stars | Stamps | Cat Shines |
Green Star #1
Near the start of the level is a portrait of Boo. Jump into it to be transported to a twisting room with a Green Star inside.
Green Star #2
In the library, start hopping on top of all the bookshelves to have them move in different directions. The bookshelves on the left hide the second Green Star.
Green Star #3
Just before the last door that leads to the flagpole is another love seat. Have it carry you to the floor above. Try to enter the green warp pipe to have it disappear and reveal a Green Star.
Stamp Location
Hop onto the love seat near the start of the level to have it float up to the Stamp above.
Check out our World 3-4: Pretty Plaza Panic guide for green star and stamp locations for the next level.
Use the links below to jump to different sections of our guide.
| Super Mario 3D World + Bowser’s Fury (Guide Hub) |
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Green Stars Walkthrough | ||
| W1 | W2 | W3 | W4 |
| W5 | W6 | W🏰 | W🐲 |
| W🌟 | W🍄 | W🌸 | W👑 |
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Stamps |  |
Cat Shines |