A coin will form part of a nationwide code-breaking challenge, with the eventual chance for competition entrants to win a gold bar. The Great British Treasure Hunt is made up of five levels, and the winner must be UK-based – although anyone can play for fun, the Mint said. 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.