Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




Number 8 is the only value possible in cell (7,7).









For column 7, Number 3 is only possible in cell (7,8)









For row 1, number 4 is only possible in cell (4,1)









For row 6, number 4 is only possible in cell (2,6)









For column 7, Number 7 is only possible in cell (7,6)









For row 6, number 5 is only possible in cell (8,6)









For column 8, Number 7 is only possible in cell (8,8)









For box 6, candidates for 1 are all in column 9, so you can remove candidates from other blocks.









For box 7, candidates for 1 are all in row 8, so you can remove candidates from other blocks.









For box 6, candidates for 6 are all in column 8, so you can remove candidates from other blocks.









Naked Pair for 1 and 6, can remove these as candidates from other cells.









Number 5 is the only value possible in cell (2,4).









Number 2 is the only value possible in cell (3,4).









Hidden Pair for 3 and 7, can remove other candidates from these cells.









Either candidate for cell (8,1) forces 7 into cell (5,5).









Number 3 is the only value possible in cell (1,5).









Number 7 is the only value possible in cell (1,4).









For row 4, number 3 is only possible in cell (9,4)









Either candidate for cell (5,1) forces 3 into cell (5,9).









Number 7 is the only value possible in cell (6,9).









Number 3 is the only value possible in cell (6,2).









For row 2, number 7 is only possible in cell (4,2)









For row 2, number 2 is only possible in cell (1,2)









For row 1, number 2 is only possible in cell (6,1)









For box 2, candidates for 1 are all in row 3, so you can remove candidates from other blocks.









X-Wing in rows for 9.









Number 4 is the only value possible in cell (9,8).









For row 9, number 4 is only possible in cell (3,9)









Swordfish in rows for 6.









Number 8 is the only value possible in cell (2,3).









For box 2, candidates for 8 are all in column 5, so you can remove candidates from other blocks.









Either candidate for cell (4,8) forces 2 into cell (4,9).









Number 1 is the only value possible in cell (4,7).









Number 5 is the only value possible in cell (4,3).









Number 6 is the only value possible in cell (3,3).









Number 1 is the only value possible in cell (6,3).









Number 9 is the only value possible in cell (6,7).









Number 2 is the only value possible in cell (8,7).









Number 6 is the only value possible in cell (8,5).









Number 8 is the only value possible in cell (8,4).









Number 9 is the only value possible in cell (8,1).









Number 1 is the only value possible in cell (1,1).









Number 6 is the only value possible in cell (7,1).









Number 8 is the only value possible in cell (5,1).









Number 9 is the only value possible in cell (2,2).









Number 5 is the only value possible in cell (3,2).









Number 6 is the only value possible in cell (5,2).









Number 1 is the only value possible in cell (7,2).









Number 8 is the only value possible in cell (9,2).









Number 6 is the only value possible in cell (4,4).









Number 1 is the only value possible in cell (2,5).









Number 2 is the only value possible in cell (9,5).









Number 6 is the only value possible in cell (1,6).









Number 8 is the only value possible in cell (6,6).









Number 1 is the only value possible in cell (9,6).









Number 9 is the only value possible in cell (1,8).









Number 1 is the only value possible in cell (3,8).









Number 8 is the only value possible in cell (4,8).









Number 5 is the only value possible in cell (5,8).









Number 6 is the only value possible in cell (6,8).









Number 6 is the only value possible in cell (2,9).









Number 9 is the only value possible in cell (9,9).