How do I knock over the pins on level W3-4 strike lake?

Is there a bowling ball somewhere that I use to knock down these pins?

1 Answer

According to this guide on IGN:

When you find the segment of Wiggler's body, he will join you and a secret path will open to the north. Jump over the bench and keep going north. This way you will find the Bowling Ball. Exit the stage with select, go to Decalburg to convert your new thing to a sticker, and then go back to the Strike Lake.

Make your way until you get in front of the bowling pins. Place the Bowling Ball sticker on the stump at the front of the screen, and then you'll be able to collect the second Comet Sticker!