text: I'm not sure exactly which ones you are referring to, but I have come across quite a few in my time.\n\nSome can merely be numbers based, for example they may get you to pick a number, multiply it by something else, add or subtract another number etc... Then with your final number they can saposedly read your mind, but really the mathematical formula leads everyone to the same number.\n\nThe other ones are more psychological and statistical, working on the most likely answers a wide range of people will come up with. They will also lead you to the answer they want through what information they give you (visual/words), like advertising.