Keeping your brain active and engaged is a key part to staying at the top of your game. Apart from math riddles, and other brain teasers, finding a good problem is hard to come by. A recent brain games challenge seeks to get you to draw an envelope, except it isn't as easy as it sounds.
Drawing an envelope without lifting your pen and not crossing lines means that you have to think a little bit outside of the box when you start. Take some time to draw and try the trick on a sheet of paper, being careful to follow all of the rules. The key is to find the corner where you need to start. Admittedly, completing this challenge didn't take me the most time, but it does offer a fun riddle.
There are a few places where you can place your pen to begin, keep trying until you find one. However, even if you start off in the right corner, you have to make the perfect set of moves to complete the puzzle without issue.
[Image Source: The Social Drop]
If this one line puzzle was a little too easy for you, check out the riddle below and see if you can solve it just as well.