On level three, “The Trainer,” Rocky met a younger, sharper version of himself rendered in cheap 3D. He fought not with fists but by reciting lines of advice he’d once barked at pupils: “Keep your chin down. Protect yourself at all times.” As he spoke, the younger Rocky softened, the polygonal jaw loosening into a grin. Beating the boss unlocked a scene he hadn’t seen in years—a letter Adrian had written but never sent, describing how proud she was of the man who learned to be gentle.