The game's climax, where you control 'The Huddle', can be considered the ultimate 'boss' challenge. It's a prolonged, destructive escape sequence where you must use The Huddle's immense mass and strength to break through barriers, solve environmental puzzles under pressure, and navigate a collapsing facility. This section is a test of everything you've learned, combining physics-based puzzles with a sense of urgency. The 'boss' here is the environment itself, constantly trying to impede your progress.
