Portal

Portals provide a special way of movement for the pieces, they connect different parts of the field. After a piece or a bonus gets into one portal, they move to the place where another portal is placed. In some cases portal is the only way to move pieces to the part of the field where it should end up, in other cases it just makes level completion easier.
You cannot match pieces through the portal. The bonuses and boosters won't explode on both sides of the portal either.