Among those that constitute the fascinating subset of brain teasers is a visual skills test. The tests challenge your power to use thought critically and to solve problems in an amazingly playful way. Not only do they challenge your observation skills, but they also stimulate your brain cells and thus increase your ability to focus; hence the manner in which they come rewarding in nature when solved. Among those that constitute the fascinating subset of brain teasers is a visual skills test. The tests challenge your power to use thought critically and to solve problems in an amazingly playful way. Not only do they challenge your observation skills, but they also stimulate your brain cells and thus increase your ability to focus; hence the manner in which they come rewarding in nature when solved. Health and Fitness, Health Tips, Exercises & Workout Tips, Diet & Wellness | Times of India Lifestyle