No. Lacking solid evidence, that's one for the philosophers among us. As a sniff test: if a simulation is good enough, then from inside it you can't determine

No. Lacking solid evidence, that's one for the philosophers among us. As a sniff test: if a simulation is good enough, then from inside it you can't determine real or simulated. If not, then maybe 'glitches' could be detected, or a kind of jailbreak is possible. But even if: why would the fundamental mechanics of our universe not look/behave like a computation? And "behaves like" != "is".