Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.

(Also read: You've got a genius-level IQ if you can figure out the total number of ducks in this tricky brain teaser) Ducks dilemma: Another puzzle leaves users guessing Previously, the same user ...

The challenge here is to count the number of watermelons in the picture. Test your attention to detail with this brain teaser puzzle. Your time starts now! Look at the image and study it carefully.

Here’s your task: find the number 98 hidden among a bunch of 93's. This puzzle may seem simple at first, but it's designed to test your brain's ability to process subtle differences under pressure.

You can print as many copies as you need. You can also share online, just if you do, please credit @2kidsandacoupon. Looking for more fall fun? Don’t miss our free fall word search for kids and adults ...

A new brain teaser shared by X left many puzzled, as it cleverly played on sibling relationships and challenged assumptions. Brain teasers are often seen as simple puzzles that can be solved quickly.