These are Mensa-style puzzles, which may be considered very difficult (especially if one is not familiar with the style of these puzzles). A link to the answers is provided at the bottom of this page, and some hints are also provided.
A renowned archaeologist is hard at work in an Egyptian city, studying the pyramids. He digs up four artifacts. Three of these were a clay goblet, a stone idol, and a mummified zebra. Which of the following was the fourth item?
silver coins, golden ankh, chipped vase, perfume vial, onyx ring Hint
You're an agent tracking Cain, a criminal in the US. He has a secret lair in one of the states.
In which one should you start looking? Hint
You work for NASA and your team is about to launch a satellite which will explore the solar system. However, your software engineer has just quit. He deleted the last letter from a series in the satellite's computer program, preventing the program from running: MVEMJSUN_
You quickly find the letter and the satellite is launched on schedule. Hint
A meteorologist found a way to accurately predict weather by analyzing the patterns of coloured light in a rainbow. Unfortunately he passed away just before his theory could be published. All of his work was in his office computer, locked by a five letter password. Relatives stated that the only thing he loved more than his work was his two children, named Roy, and Biv. What is the password to his computer? Hint
Here are all the answers. Please note, this is not an IQ test. If you are interested in estimating your IQ, try this self-marking IQ Test.