This puzzle is a classic component of a Professional IQ Intelligence Test, designed to evaluate your Spatial Logic and Visual Attention. Practicing these scans is an excellent form of Brain Fitness that promotes Cognitive Health and supports Healthy Aging. Following the systematic logic shown in the answer key, we can find 18 triangles by scanning each horizontal level: Top Level Triangles (using the 1st horizontal line): 6 variations. Middle Level Triangles (using the 2nd horizontal line): 6 variations. Full Level Triangles (using the bottom base line): 6 variations. Total Count: 6 + 6 + 6 = 18 triangles. Stay Sharp Tip: High-quality Intelligence Quizzes like this encourage your brain to organize complex visual data. Regularly challenging your mind with these cognitive assessments is scientifically linked to improved mental clarity and focus, ensuring your brain stays active and resilient as you age.