Yes, vouchers must be redeemed online in advance. Vouchers are not able to be redeemed on the day of your planned visit, either online or at the attraction. If your chosen day isn't able to be selected when booking, your voucher is either not valid on that specific day or is fully booked.
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. All promotional offers are also subject to availability and Terms and Conditions apply. Check the voucher for further details and restrictions.