What are the Portals in Match-3 Elements? There will be instances where you'll see a Blue and Orange ring in certain areas of the puzzle. These are portals, and they transport pieces by letting pass through the opening.
(Source: Playrix.com)
There will be times where you'll need to clear a puzzle such as a donut to go to the bottom, but there are 2 parts of the puzzle map. Portals can be available there and they are usually blocked by obstacles, so you need to clear those first.