Carefully sneak past the first few Wigglers at Point 1, then jump up through the yellow walkways overhead. Hit the ? Blocks as you go to grab a valuable power-up on the way up.
When you’re on the second yellow platform, make a right and explore the area to the right. It hides a secret niche with a POW Block! Use it to take out all of the Wigglers to the left of the secret niche.
Duck into the small holes in the ground to allow the Big Wigglers to pass you by.
Wait for a Big Wiggler to crawl out of the purple muck below to bounce on it and cross the chasm.