Sudoku1 - Varient Numeral

Varient : Numeral

Cells with a letter in background contain a digit for which the corresponding numeral contains the given letter. Correspondances are given under the grid.
By pushing button

of the toolbar, possible values are filtered using combinations available, if only one possible solution. In the resolution methode, select the method "Variant" to take into account these combinations.

Here is an example of grid:
If the number in a cell is 4, so letters C, H, A or R can be selected.
If you have a 0, this is only in DOU, si number is 2.