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 (1,1)









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









For row 2, number 7 is only possible in cell (9,2)









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









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









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









Number 9 is the only value possible in cell (2,1).









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









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









For box 3, Number 9 is only possible in cell (7,3)









For box 4, candidates for 9 are all in row 6, so you can remove candidates from other blocks.









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









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









Candidates for 2 in boxes 4 and 6 force the candidates in box 5 to be in the remaining line.









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









For row 4, number 3 is only possible in cell (5,4)









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









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









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









Hidden Pair for 2 and 8, can remove other candidates from these cells.









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









Either candidate for cell (4,5) forces 3 into cell (8,3).









Number 5 is the only value possible in cell (1,3).









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









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









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









Either candidate for cell (5,5) forces 6 into cell (8,8).









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









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









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









Number 3 is the only value possible in cell (1,2).









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









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









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









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









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









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









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









Number 4 is the only value possible in cell (9,8).









Number 2 is the only value possible in cell (9,1).









Number 4 is the only value possible in cell (7,1).









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









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









Number 2 is the only value possible in cell (1,4).









Number 5 is the only value possible in cell (7,4).









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









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









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









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









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









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









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









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









Number 8 is the only value possible in cell (5,3).









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









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









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









Number 4 is the only value possible in cell (8,6).









Number 8 is the only value possible in cell (9,6).









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









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









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









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