Whitey, an albino alien xenobiologist, needs roof-rat melanin from a hair follicle to refill his protective-pigment tank before Earth’s sun ends him. The plan: hide in a blueberry meant for Sweetie. The plan goes sideways. Now you’re inside Blondie (Rab38-null) on a tour of every tissue where one trafficking gene’s loss tells a different story, platelets without dense granules, lungs with engorged lamellar bodies, a leaky proximal tubule, mast cells with blunted histamine, an empty hair follicle. Whitey wonders aloud at every station; the player investigates; verdicts get logged as SUPPORTED, WEAKENED, or UNTESTED. The UNTESTED list is the game’s quiet teaching point: science has real frontiers. Type HINT if you get stuck. ← All Roof Rat Adventures