Boost your brain's speed with a huge portion of IQ riddles! Turn on your imagination, activate your brain and stay focused to solve all the riddles on time. Some of these riddles are really hard, so just

Hello Steemians!  I found a pretty interesting riddle in a book I recently bought.   The book is called: Einsteins Riddle Universe (German: Einsteins Rätsel Universum). It is all about riddles that