Do I need to pre-book with my Merlin Pass to visit The Edinburgh Dungeon? Yes - All guests, including Merlin Pass holders, must be pre-booked in advance with limited numbers available, please click here to secure now. Related articles How do I purchase Merlin Annual Pass Friends and Family tickets for The Edinburgh Dungeon? How do I redeem my Merlin Pass Share the Fun vouchers? How long will I be in the Edinburgh Dungeon? How many people are on each tour? Are there any restriction dates for using my Merlin Pass at The Edinburgh Dungeon?