The Second Chance Draw allows you to have use a "Chance Card" to win any of the promotional prizes including entry to Merlin Attractions such as Madame Tussauds Sydney.
If you win entry for a Merlin attraction as part of your "Chance Card" you may redeem this through the McDonald's website here for your chosen attraction, for example SEA LIFE Kelly Tarlton's. You will then need to follow the standard redemption process of printing out your entry voucher and attached you Chance token to exchange for you entry ticket at SEA LIFE Kelly Tarlton's.
For a Guide on how to redeem the Chance card along with registering on the app to redeem, please see below: