Blue Prince Stamp and Postcard SetPhilatelists rejoice: Blue Prince features something you wont see in many games all original, 20th century inspired stamps, with scenic postcards to match. Without saying too much, geography and iconography are of paramount importance to the mysteries of Blue Prince, so these in game ephemera are nothing short of a stroke of genius. When it came time to build out real world merch for the game, we at iam8bit wanted to make sure these postcards and