Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




Number 5 is the only value possible in cell (7,8).









For row 4, number 8 is only possible in cell (6,4)









For row 5, number 8 is only possible in cell (7,5)









For row 9, number 5 is only possible in cell (6,9)









For column 9, Number 5 is only possible in cell (9,1)









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









For row 2, number 3 is only possible in cell (1,2)









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









For row 3, number 8 is only possible in cell (2,3)









For column 1, Number 8 is only possible in cell (1,9)









For row 2, number 5 is only possible in cell (3,2)









For row 5, number 5 is only possible in cell (1,5)









For column 3, Number 2 is only possible in cell (3,5)









For row 2, number 9 is only possible in cell (5,2)









For row 1, number 9 is only possible in cell (8,1)









For column 3, Number 9 is only possible in cell (3,8)









For column 9, Number 9 is only possible in cell (9,9)









For column 9, Number 2 is only possible in cell (9,6)









For column 4, Number 4 is only possible in cell (4,1)









For row 1, number 8 is only possible in cell (5,1)









For row 8, number 8 is only possible in cell (4,8)









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









For box 2, candidates for 6 are all in column 6, so you can remove candidates from other blocks.









For box 2, candidates for 1 are all in column 6, so you can remove candidates from other blocks.









For box 5, candidates for 7 are all in row 5, so you can remove candidates from other blocks.









For box 6, candidates for 7 are all in row 4, so you can remove candidates from other blocks.









For column 3, Number 7 is only possible in cell (3,1)









For blocks 7 and 8, candidates for 7 are all in the same two rows (7 and 9)









X-Wing in rows for 4.









For box 4, candidates for 4 are all in row 4, so you can remove candidates from other blocks.









Hidden Pair for 3 and 4, can remove other candidates from these cells.









Swordfish in rows for 6.









Either candidate for cell (1,1) forces 4 into cell (1,7).









Number 1 is the only value possible in cell (8,7).









Number 7 is the only value possible in cell (8,4).









Number 6 is the only value possible in cell (9,4).









Number 4 is the only value possible in cell (9,3).









Number 6 is the only value possible in cell (7,2).









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









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









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









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









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









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









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









Number 3 is the only value possible in cell (9,5).









Number 4 is the only value possible in cell (8,5).









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









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









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









Number 9 is the only value possible in cell (4,7).









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









Number 1 is the only value possible in cell (4,5).









Number 7 is the only value possible in cell (5,5).









Number 9 is the only value possible in cell (6,5).









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









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









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









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









Number 7 is the only value possible in cell (9,8).









Number 7 is the only value possible in cell (2,9).









Number 2 is the only value possible in cell (4,9).









Number 1 is the only value possible in cell (5,9).









Number 4 is the only value possible in cell (7,9).