Lifebuoys act as portals between the borders of the match-three level. Items that fall into one lifebuoy will come out through the lifebuoy that is connected to it. They cannot be moved or destroyed.

If there is an item that's not affected by gravity (such as a Crate) on top of the Lifebuoy, it will block the Lifebuoy and items won't fall through it anymore until the item blocking it is cleared.