Mensa's registered office is Slate Barn, Church Lane, Caythorpe, NG32 3EL, United Kingdom. MENSA is registered around the world as a trademark/service mark of Mensa International Limited and/or affiliated national Mensa organizations. The Mensa logo is a registered trademark of Mensa International Limited.Mensa does not hold any opinion, nor does it have or express any political or religious views.e offer 2 ways to practise: 1  Our online Mensa Workout is an intelligence quiz in which you have half an hour to answer 30 questions. 2  In some countries, a pre-test is available which you can take in the privacy of your home.