Dr. Luigi is a fictional character from the popular video game series Mario. He is the younger brother of Mario and is known for his green hat and overalls. Dr. Luigi often appears in various games, including spin-offs like Dr. Mario, where he takes on the role of a doctor who fights viruses using colored pills. In Dr. Mario, players control Dr. Luigi to eliminate viruses by matching colored capsules. The game combines elements of puzzle-solving and strategy, making it engaging for players of all ages. Dr. Luigi's character adds a unique twist to the Mario franchise, showcasing his skills in a medical-themed setting.