Mensa is the organisation for bright people and we were honoured to be asked to help them celebrate their 75th anniversary with a set of six stunning stamps.

Our stamps are based on puzzles, the kind of brain-teasers that Mensa is known for. Can you solve them all? Our stamps also contain many codes, layers of information, a cypher and references to places that are important to the organisation.

To read more about the Mensa stamps, please follow this link.