Looks like a holiday deal as only from December 2012 to March 2013
Fine print
Vouchers must be exchanged for the iVenture Card pass by 30 March, 2013. Pass expires on 30 March, 2013. Cannot be redeemed before 21 December, 2012.
Adults pay $49 and save 52% off individual ticket prices
Children can pay just $25 and save 60% off individual ticket prices
Choose from the following attractions:
-SEA LIFE Sydney Aquarium
-IMAX Theatre Sydney
-Madame Tussauds
-Magistic Cruises 1-hour cruise
-Sydney Tower Eye & 4D Cinema
-Powerhouse Museum
-Hyde Park Barracks
-Chinese Garden of Friendship
-Museum of Sydney
Could you please put 'Sydney' in the title, OP?