mysterium insert fs mys folded spaceNote: Insert designed for game with external box dimensions of 28. 6 x 28. 6 x 7. 6 cm. Insert compatible with Mysterium, and the Hidden Signs and Secrets & Lies expansions. There is space also for any promo cards you might have. The design provides both efficient storage and improved game play. Many of the trays can be utilised during the game, and they greatly aid set up and clear away times. The rules and boards act as a lid on top of the trays.