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 7, number 1 is only possible in cell (9,7)









For row 2, number 1 is only possible in cell (4,2)









For row 3, number 1 is only possible in cell (7,3)









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









For row 9, number 2 is only possible in cell (1,9)









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









For row 1, number 8 is only possible in cell (4,1)









For row 8, number 7 is only possible in cell (6,8)









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









For row 3, number 8 is only possible in cell (1,3)









For row 3, number 9 is only possible in cell (2,3)









For row 7, number 8 is only possible in cell (6,7)









For row 4, number 8 is only possible in cell (5,4)









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









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









For row 3, number 5 is only possible in cell (8,3)









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









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









For box 4, candidates for 9 are all in column 1, so you can remove candidates from other blocks.









For box 4, candidates for 4 are all in column 1, so you can remove candidates from other blocks.









Naked Triple for 3, 4 and 6, can remove these as candidates from other cells.









Swordfish in columns for 6.









Either candidate for cell (4,7) forces 2 into cell (8,8).









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









Number 9 is the only value possible in cell (1,4).









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









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









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









Number 9 is the only value possible in cell (7,5).









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









Number 4 is the only value possible in cell (1,6).









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









Number 6 is the only value possible in cell (8,7).









Number 5 is the only value possible in cell (1,7).









Number 6 is the only value possible in cell (1,2).









Number 4 is the only value possible in cell (3,1).









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









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









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









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









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









Number 4 is the only value possible in cell (6,3).









Number 6 is the only value possible in cell (4,3).









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









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









Number 3 is the only value possible in cell (4,6).









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









Number 9 is the only value possible in cell (3,7).









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









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









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









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









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









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









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