This stage is Fuzzy Time Mine (6-7). This complete walkthrough will provide you with a 100% video playthrough and a screenshot of where you can find all the green stars. The key to getting all the stamps and green star in this stage is to act fast so that the Fuzzy does not get to you.
Game Play Walkthrough Video
Green Star 1
The first green star is found under a cloud platform, you will need to do a ground pound to bypass the cloud.
Green Star 2
When the course scrolls up the second time, the Green Star is located on top of a tilting platform. You will have to be quick to collect this green star.
Green Star 3
As the level scrolls upward the final time, you will have to move to be ahead of the screen for this one. Jump and hide inside the hole in the wall to grab the star.
You won’t miss the stamp. Wait for the moving block to open to collect the stamp.