Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




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









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









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









Number 7 is the only value possible in cell (6,3).









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









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









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









For row 4, number 7 is only possible in cell (1,4)









For row 6, number 3 is only possible in cell (4,6)









For column 1, Number 4 is only possible in cell (1,2)









For row 4, number 1 is only possible in cell (9,4)









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









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









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









Number 5 is the only value possible in cell (1,6).









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









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









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









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









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









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









For box 7, candidates for 2 are all in column 3, so you can remove candidates from other blocks.









For box 1, candidates for 9 are all in column 3, so you can remove candidates from other blocks.









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









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









Swordfish in rows for 9.









Either candidate for cell (2,2) forces 8 into cell (2,1).









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









Number 3 is the only value possible in cell (7,1).









Number 9 is the only value possible in cell (1,7).









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









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









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









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









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









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









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









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









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









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









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









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









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









Number 9 is the only value possible in cell (3,2).









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









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









Number 6 is the only value possible in cell (2,4).









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









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









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









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









Number 5 is the only value possible in cell (2,8).









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









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









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









Number 1 is the only value possible in cell (3,9).









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