<section> <h2> <h1>5 Logical Riddles That Will Train Your Mind</h1> </h2> Time for some mental exercise. Kill your boredom and solve these mind-boggling riddles. If you think you’re a pro at them, this test will prove it within minutes. Find out where you stand. </section> <section> <h2> <h2>There is an ancient invention still used today in some parts of the world which allows people to see through walls. What is it?</h2> </h2> </section> <section> <h3> <h2>There is a common 9-letter word in the English language, such that if you keep removing its letters one by one, the resulting 8 words are still valid. What is this word?</h2> </h3> <em>Remark: The removed letters do not need to be from the beginning or the end of the word.</em> </section> <section> <h3> <h2> <h2>Puzzil Primus was born on the 314th day of year 20B.C. and died on the 271st day of year 20A.D. How old was he when he died?</h2> </h2> </h3> </section> <section> <h3> <h2> <h2>What four-letter word can be written forward, backward or upside down, and can still be read from left to right?</h2> </h2> </h3> </section> <section> <h3> <h2>I am white when I am dirty, and black when I am clean. What am I?</h2> <div><span style="font-family: Arial; font-size: 13px; white-space: pre-wrap; background-color: #ffffff;"> </span></div></h3> </section> <section> <h2> <h2>Push yourself to win next time!</h2> </h2> </section> <section> <h3> <h2>Nice job! You're almost there</h2> <h2><strong> </strong></h2> </h3> </section> <section> <h3> <h2>Yayiee! You're brilliant.</h2> </h3> </section>