Only overthinkers will make it through all 21 riddles in this ultimate brain teaser challenge. Test your logic, pattern recognition, and problem solving skills with tricky riddles designed to fool ...

Visit Insider's homepage for more stories. Sometimes puzzles are so obvious that they're nearly impossible to solve.

There’s a certain state of mind I call crossword brain: It’s both intuitive and counterintuitive, knowing when to turn away from the seemingly obvious solution, but also knowing when to trust your ...