See if you can spot Queen Elizabeth II in this royal brainteaser ahead of her Platinum Jubilee celebration in June.
The record to solve this Mother's Day hidden-image puzzle is 32 seconds—can you beat it?
Are you smarter than a Victorian?
You don't need a ton of algebra knowledge to solve this math problem from MIT's 1876 entrance exam, but it helps.
This illustrated brainteaser is hiding a birthday gift—see how long it takes you to spot it.