Can a life be simulated so completely that no one, inside or out, can tell it from a real one? That is the claim this final part tests, and it is the one claim the record can settle. Google DeepMind's Genie Three, Runway's GWM Worlds Two and World Labs' Marble each build a place, and none builds an inhabitant; the builders' own documents name the gaps. Roblox calls the result a guided dream, spectacular but fleeting and incredibly lonely, and Upload VR counts the years. Set beside a lived decade, a striking minute is the distance. This part states both readings at full strength, names the test that would settle the question, and works out what follows — including the symmetry that turns the argument back on us, and the one thing that cannot be known from inside.

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