India is hosting the ongoing 7th round of World Sudoku GP 2018 and Spiral Sudoku is a part of this round. So, I thought to create a Spiral Sudoku. Practise this and then do participate in the GP too.
Rules: Place a digit from 1-9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. Additionally, exactly 3 of the 3x3 boxes have the property that their eight perimeter cells are in strictly increasing order with starting cell and direction unspecified. The 3 spiral boxes, and the starting cell and direction in these boxes need to be identified as a part of solving.
