Introduction to Lognumber
In recent years Sudoku has become very popular. Several variants of the original puzzle have been developed, including LOGnumber.
Suitable for both adults and children, the puzzles will bring a lot of enjoyment during a short break or longer leisure time.
The rules of LOGnumber are just as simple as Sudoku, although a little more concentration may be needed as each square contains two numbers.

Rules
You have to fill in numbers from 0 to 9 in the empty squares on the board so each number only appears once in each row (horizontal), column (vertical) and diagonal (the grey squares).
In each square there must be two numbers, in any sequence.

Solving a LOGnumber

Figure A
Several numbers have already been filled in. Your task is to find the missing ones.

Figure B
Once a number has been filled in, it cannot be repeated in the same row, column or (if in a grey square) diagonal. The 9 in the centre square therefore excludes quite a few possibilities.

Figure C
Example: In the marked row, two of the white squares have already been filled in, and 9 cannot be in a grey square, therefore 9 has to be in the first white square. In the marked row, 0 must also be in the first square since it is cannot be in any of the grey squares in that row.

The same procedure is followed when filling in the remaining squares.

Figure D
The completed example.