Nothing is quite as gratifying as figuring something out. Whether it's where you left your keys or how to solve a Rubik's Cube, life's puzzles can vex us all in the moment. But they're oh-so-satisfying on the other side. That's what our special
issue is all about—the sense of supreme satisfaction after nailing an answer that's doing its best to hide from you. The collection, gathered from of Discover's best columns by Scott Kim and Eric Haseltine—Bogglers, Mind Games and NeuroQuest—is guaranteed to stretch your brain in every direction: word-based puzzles, number games, visual illusions and more. If you purchased Mind Games, thank you! But after picking up this special issue, we didn't want you to chop it apart to solve the puzzles. So, below, you'll find full-size .pdfs of puzzles found in the issue. Instead of mutilating your copy, print these off and have at it!