Summer is the perfect time to sit back, relax, and tackle some puzzles. If you enjoy testing your brain, this brainteaser is just for you.

In this image created by Low Cost Glasses, a man is depicted feeling the summer heat.

The challenge is to spot four main differences between the two versions of the image.

While three of the changes are fairly easy to find, only one in four people can spot the final one.

According to the creators, it typically takes between 36 and 45 seconds to find all four…