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An answer is a measured zero-resistance $T_c$ with Meissner response, or a model of $T_c$ versus in-plane lattice constant and c-axis structure that predicts the ceiling.","problem_ref":"213a8e32a9af1b62bce6d9c0b9e498233701f766a5136c76569b377330ef5d6d","references":"","settled_by":"Films with zero resistance and diamagnetic shielding at the predicted ceiling, together with structural refinement showing the strain state.","status_note":"Onset $T_{c}$ rose from about $40\\ \\mathrm{K}$ (early 2025) to about $63\\ \\mathrm{K}$, with zero resistance near $37\\ \\mathrm{K}$, in (La,Pr)3Ni2O7 films on $\\mathrm{SrLaAlO_4}$ (reported late 2025, published 2026).","title":"How high can $T_{c}$ reach in ambient-pressure nickelate 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