The portal is not active and you need to use it right now to enter other realm. Collect sweets and when you get them all the portal becomes active.
Be the participant in Grims adventures and find the sweets that can activate the portal. Can you reach them all? The position of some sweets on the map is distant and hard to get. You will have to use pumpkins to jump higher or bats, even your friend is here to help so don't mind to use his help. Get all sweets and pass all portals.