- Green Star 1: After the two switchboard rooms, use a fire flower to light the unlit torches. After all of them are lit, you can collect the star.
- Green Star 2: At the checkpoint, don't enter the next room. To the right of the flag there is a tunnel leading to the second star.
- Green Star 3: Before entering the green pipe, use a cat suit to climb the wall behind it and collect the last star.
I the room full of lava, stand on the platform. When it stops, jump and get the stamp before continuing. Be careful not to fall into the lava.