Sudoku 4×4 Hard — Set 100By skyseed_admin / April 9, 2026 hard 4×4 Set 100 Complete the sudoku grid (9x9): each row, column, and box must contain each digit exactly once. Grid: [_ 3 4 _ | _ 1 3 _ | 3 _ _ 4 | _ _ _ 3] Check Answers Reveal Solution Reset