No, the ticket is for both ways.

You buy the tickets on board. with cash, card, credit card and Vipps (external link)

Yes, as long as there is space on board. You will also need to buy a ticket for bringing the bike which is 40kr.

No, but the capacity of the vessel is 40 persons and we will sail continiusly until there is no more people.

Yes! Yes, but you have to buy a ticket for the dog which is NOK 40,-