The video above is your only clue. Your mission, if you choose to accept it: find this signed and authenticated print of Banksy's "No Ball Games" within the next 30 days at one of the Art Series hotel chains—snatch it without getting nabbed and it's yours to keep. The piece is stashed somewhere in the Melbourne area and worth $15,000AU.
Be warned, the artwork moves from hotel to hotel during the promotion's run so you'll either need to live out of a suitcase for the next month or excel at casing.
According to the hotel chain, the contest is being held to commemorate when, " in 2007, a group of bandits removed a section of a wall with an angle grinder because Banksy had stencilled around the 'No Ball Games' sign on it. The wall was later found on ebay for sale for 20,000 pounds."