There is another important factor: they are universal. You don’t need technical knowledge or specialized expertise. Just observe, think and experiment with combinations. This makes them accessible to both children and adults.
Besides being fun, these types of challenges have real benefits. They keep the mind active, improve mental agility and especially creativity. Solving visual puzzles regularly helps train the ability to see more than one possible interpretation of the same image, a useful skill even outside of gaming.
They also involve patience. Often the first idea is not right and you have to make a window from the beginning to see something from a different angle and rethink the solution. This habit of trying again strengthens your tolerance for frustration and perseverance.
In a fast-paced world where everything is explained instantly, these little riddles make us stop and think. They remind us that not everything can be understood at a superficial glance and that the brain thrives when faced with a challenge.