Are there restrictions for using a Merlin Pass at The London Dungeon? For information regarding restrictions, please visit https://www.merlinannualpass.co.uk/ Related articles Do I need to pre-book entry with my Merlin Pass? What is the recommended minimum age? Can I contact you via Live Chat? How do I redeem my Merlin Pass Share the Fun vouchers? I am a Merlin Pass holder, how do I pre-book entry?