Two secret agents need to meet for the very first time. They don’t know anything about each other—can’t even be sure that they live in the same hemisphere—and they will recognize the other agent when ...

Test your problem-solving skills with these 62 lateral thinking puzzles. They’ll challenge you to think out of the box to find a solution.

Solving riddles isn't just about flexing your brain muscles—it's also a great way to improve critical thinking skills. Riddles challenge us to think outside the box and come up with creative solutions ...