Your Kellogg's snack pack product doesn't contain a unique booking code. You can pre-book your tickets via the Kellogg's Merlin Magic website and follow the steps to complete your booking.
Please note all promotional tickets must be pre-booked to guarantee entry. On arrival at the attraction, you are required to present the promotional voucher along with your pre-booked e-ticket. If a valid voucher cannot be supplied, you'll be required to purchase your second ticket at full gate price at Admissions and entry is not guaranteed.