Read our Privacy noticeThe Royal Mint is set to launch a nationwide code-breaking challenge, with the chance for competition entrants to win a solid gold bar. Entrants must successfully complete levels two to five inclusive of the treasure hunt by 11.59pm on March 30. This isn’t just a coin; it’s an invitation to a nationwide intellectual adventure.”Nicola Mitchell, chief commercial officer at the Royal Mint, said: “The Royal Mint is stepping into a new era of coin collecting. “The Great British Treasure Hunt coin is not just a beautiful collector’s item; it’s an interactive device with more than meets the eye. The coin will not be going into general circulation, the Royal Mint said.