If you have managed to solve the nine-dot problem, you may want to dig into a new out-of-the-box thinking challenge.
The above figure is a quadrat (defined as rectangle with four equal sides and four 90-degree angles), which is defined by four dots.
Your task is to enlarge the quadrate to its double size by moving only two of the dots.
You can find the solution here
Test yourself with some other outside-the-box challenges
Creativity boost 