Teleporters are used to transport candies and falling blockers from one area to another. There are two types of teleporters, which are dependent on each other. The blue circle is where candies and movable blockers go through and the pink circle is where they come out.
Sometimes, a teleporter exit is placed at the same location with a spawning point. In this case, the teleporter will ensure up to one item to pass, unless the spawning point has created enough items in that move.