Explore an in-depth code review of Hazel, a game engine developed by The Cherno. Dive into the engine's architecture, including its repository structure, project overview, and line count. Learn how to run Hazel, understand its entry point, and examine the application architecture with its layered design. Discover the event system, main application loop, and the Hazelnut editor. Gain insights on handling large source files, scene management, and rendering architecture. Conclude with a discussion on future development steps for the Hazel game engine.