Multi-sudoku. №21206

Left click/tap - search for numbers with pre-focus. Right-click - reverse search. In each cell, you can make notes, inserting up to 20 digits and other characters. When clicked, green areas are highlighted areas, which affect the selected cell. Red - the cells with the inconsistency found sudoku conditions. "/" (Slash) - get all possible variant for free cell.

Numbers by left button   Highlight areas   Highlight identical digits   Highlight candidats Screen keyboard