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 1 is only possible in cell (4,1)









For row 6, number 1 is only possible in cell (3,6)









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









For row 8, number 1 is only possible in cell (6,8)









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









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









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









For box 6, Number 9 is only possible in cell (8,5)









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









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









For row 5, number 2 is only possible in cell (4,5)









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









For box 4, candidates for 8 are all in row 5, so you can remove candidates from other blocks.









For box 3, candidates for 6 are all in row 3, so you can remove candidates from other blocks.









For box 7, candidates for 3 are all in row 9, so you can remove candidates from other blocks.









Naked Pair for 5 and 7, can remove these as candidates from other cells.









Naked Pair for 8 and 9, can remove these as candidates from other cells.









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









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









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









For blocks 4 and 7, candidates for 8 are all in the same two columns (1 and 2)









Hidden Pair for 2 and 6, can remove other candidates from these cells.









Swordfish in rows for 7.









Either candidate for cell (9,9) forces 6 into cell (4,8).









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









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









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









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









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









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









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









For column 6, Number 8 is only possible in cell (6,2)









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









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









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









For row 2, number 6 is only possible in cell (5,2)









For row 6, number 3 is only possible in cell (7,6)









For box 3, candidates for 5 are all in column 8, so you can remove candidates from other blocks.









Either candidate for cell (1,2) forces 7 into cell (1,4).









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









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









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









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









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









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









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









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









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









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









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









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









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









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









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









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









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









Number 7 is the only value possible in cell (5,3).









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









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









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









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









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









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









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