Spooky Scraps! Don't Get Spooked!
From the Super Mario Wiki
The level begins in an area with many transparency sheets, which reveal platforms and beads but make enemies invincible. After two Boo Guys, Yoshi will encounter more transparency sheets, a few Wiks, and yet even more transparency sheets leading to a door, which in turn leads to the first checkpoint. More transparency sheets follow, with a few ropes leading to secret areas. The final secret area contains a key, which Yoshi must use to unlock the Locked Door afterwards, leading to the second checkpoint. The next segment of transparency sheets continually move to give that portion of the level an autoscrolling feel, complete with more Boo Guys and Wiks. This segment continues until the next door, which leads straight to the goal roulette.
Collecting all of the Wonder Wools knits Nighttime Yoshi (known as Night-time Yoshi in PAL regions) back together.
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