To celebrate its centenary, Commonwealth Bank of Australia is launching a Facebook-based treasure hunt called the Time Vault.
For 10 days, starting on the 21 November, the bank will pose a question on Facebook relating to a decade of its 100-year history.
Participants will be sent on a 'treasure hunt' style quest to collect information, clues or codes in which to answer the question correctly.
Once they have an answer, players will enter it in Time Vault Facebook tab along with their contact details. Each correct answer will go into a draw for the chance to win a A$2000 cash prize.