Recover 7 progressively corrupted, genuinely hard variant-Sudoku puzzles (50-54 near-minimal blank cells)…

Recover 7 progressively corrupted, genuinely hard variant-Sudoku puzzles (50-54 near-minimal blank cells)…: a task in Long-Horizon Terminal-Bench (LHTB) (Harbor dataset). You must RECOVER a series of corrupted Sudoku puzzles, one after another, advancing through as many levels as possible. There…