Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




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









For row 7, number 5 is only possible in cell (1,7)









Number 8 is the only value possible in cell (1,2).









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









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









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









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









Number 6 is the only value possible in cell (8,2).









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









For row 4, number 3 is only possible in cell (7,4)









For column 8, Number 3 is only possible in cell (8,1)









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









For box 9, candidates for 9 are all in row 8, so you can remove candidates from other blocks.









For box 5, candidates for 6 are all in row 4, so you can remove candidates from other blocks.









For box 7, candidates for 6 are all in row 8, so you can remove candidates from other blocks.









Naked Pair for 4 and 7, can remove these as candidates from other cells.









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









For row 3, number 1 is only possible in cell (4,3)









For row 4, number 1 is only possible in cell (3,4)









For box 5, candidates for 4 are all in column 5, so you can remove candidates from other blocks.









For box 6, candidates for 7 are all in row 5, so you can remove candidates from other blocks.









Swordfish in rows for 4.









Naked Triple for 2, 7 and 9, can remove these as candidates from other cells.









Either candidate for cell (2,1) forces 6 into cell (6,1).









Either candidate for cell (2,4) forces 9 into cell (2,1).









Number 8 is the only value possible in cell (4,1).









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









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









Number 9 is the only value possible in cell (6,3).









Number 8 is the only value possible in cell (9,3).









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









Either candidate for cell (2,9) forces 6 into cell (2,8).









For row 5, number 6 is only possible in cell (3,5)









Either candidate for cell (2,9) forces 7 into cell (5,9).









Number 4 is the only value possible in cell (5,6).









Number 6 is the only value possible in cell (5,4).









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









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









Number 7 is the only value possible in cell (2,3).









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









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









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









Number 8 is the only value possible in cell (3,6).









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









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









Number 2 is the only value possible in cell (8,6).









Number 6 is the only value possible in cell (4,7).









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









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









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









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









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









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









Number 4 is the only value possible in cell (1,8).









Number 3 is the only value possible in cell (6,8).









Number 7 is the only value possible in cell (3,8).









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









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









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









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









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









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