Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




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









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









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









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









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









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









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









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









For row 9, number 6 is only possible in cell (7,9)









For row 9, number 4 is only 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 (3,7).









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









For row 1, number 5 is only possible in cell (3,1)









For blocks 2 and 8, candidates for 7 are all in the same two columns (5 and 6)









Candidates for 4 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.









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









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









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









For row 9, number 2 is only possible in cell (5,9)









Hidden Pair for 1 and 5, can remove other candidates from these cells.









For box 8, candidates for 9 are all in column 4, so you can remove candidates from other blocks.









X-Wing in rows for 5.









Naked Pair for 1 and 3, can remove these as candidates from other cells.









Either candidate for cell (4,7) forces 3 into cell (4,9).









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









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









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









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









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









Number 9 is the only value possible in cell (3,5).









Number 7 is the only value possible in cell (3,4).









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









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









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









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









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









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









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









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









Number 3 is the only value possible in cell (6,5).









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









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









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









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









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









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









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









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









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









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









Number 2 is the only value possible in cell (8,4).









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









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









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









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









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









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









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









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









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









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









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