Game design tools are software applications that help developers create video games. These tools can include level editors, animation software, and programming environments. They allow designers to build game worlds, create characters, and implement gameplay mechanics without needing extensive coding knowledge. Popular game design tools include Unity, Unreal Engine, and GameMaker Studio. Each tool offers unique features tailored to different types of games and skill levels. For example, Unity is known for its versatility and is widely used for both 2D and 3D games, while GameMaker Studio is often favored for simpler, 2D projects.