Sudoku helper

runs in your browser Rows R1–R9 from the top, columns C1–C9 from the left.

Enter the grid (big digits, and your notes if you use them), then click Hint. Each click on More detail reveals a bit more: the technique first, then the cells, then the full explanation.

Import / export text

One line per row, 9 cells per line: a placed digit (6), notes (1235), a single note ((5)), or . for an empty cell. 81 characters with 0 for empty cells also work.