Sudokus with double patterns

(Example of a double pattern in a Sudoku)

The three digits in the yellow colored pattern, combined with the six digits in the blue pattern, must be filled with the numbers 1 to 9. This also applies to other patterns (gray, red, etc.). This patterns must always be combined with the yellow pattern.

Download the Sudokus with double patterns:

Variant 1 double patterns:
** moderate
*** difficult
***** extreme difficult

Variant 2 double patterns:
** moderate
*** difficult
**** very difficult

Variant 3 double patterns:
** moderate
**** very difficult
***** extreme difficult

Variant 4 double patterns (with 5 blocks):
*** difficult

Variant 5 double patterns (with 8 blocks):
*** difficult

Variant 6 double patterns (with 12 blocks):
*** difficult