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The game consists of three celebrities indentifying four places around the United Kingdom, as well as a supplementary question set in those locations. The four locations join up to form a giant X on the map. Where the two lines cross, a treasure is (metaphorically) hidden. The panel have to identify the treasure using up to four lines of a riddle gained by answering the supplementary questions correctly. Unlike the UK television programme Treasure Hunt, the treasure is not actually buried in the soil and the panel do not have to fetch it, merely identify it.
The questions are written by David J. Bodycombe and the programme is an independent production by Hewland International for Radio 4.