While simulation tools have revolutionized the design and testing process for automotive radar, there are still some unique challenges to overcome at 77 GHz. These include the effects of rain, snow, and other environmental factors on radar performance, as well as the need for accurate modeling of complex antenna and radome geometries. Fortunately, advancements in simulation software and hardware are helping to address these challenges. An engineer can choose the simulation method that fits project goals and saves time and effort: using Hybrid Solver for fast estimations or creating a full Digital Twin for thorough analysis.