Can I pre-book online with my 2 for 1/promotional voucher? All tickets, including promotional vouchers, must be pre-booked in advance with limited numbers available, please click here to redeem your promotional voucher. Related articles Is my 2 for 1 voucher valid at the York Dungeon? How do I use my Kellogg's Grown Ups Go Free voucher online? Do you offer a family rate for The York Dungeon? How old must you be to enter The York Dungeon? How do I contact you with a guest enquiry?