SUDOKU QUARTERLY of the third quarter of 2020 contains
the thirteen issues of SUDOKU WEEKLY of week 26 to week 39.
Each week, there is a Sudoku for each day.
All these Sudokus are magic:
From Monday (which has only one magic block)
until Saturday (with six magic blocks) each weekday has
one more magic block than the previous day.
On Sunday all blocks are magic.