Pablo's Armchair Treasure Hunt (ATH) is an engaging annual event held each Christmas, challenging participants with intricate puzzles that lead to a hidden treasure box in the south of England, approximately 100 miles from London. Open to anyone with a computer and a bit of free time, this treasure hunt promotes teamwork, as solvers often collaborate in groups or families to tackle the series of linked challenges. Participants are not required to register, but doing so allows setters to provide useful updates and insights.

The event emphasizes discretion, encouraging teams to avoid discussing their strategies outside their group. Once the treasure is found, participants must carefully follow instructions to claim their discovery, ensuring that the treasure box is returned to its original hiding spot. Prizes, including the prestigious Pablo Memorial Trophy and the Dave Harding Trophy, are awarded for achievements in solving puzzles and submitting exceptional solutions. Additionally, a pre-hunt poster offers clues and minor puzzles to spark interest. With virtual finds accepted under specific conditions, Pablo's ATH invites everyone to join in a fun and mysterious adventure, leveraging creativity and reasoning skills.