Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




Number 3 is the only value possible in cell (8,4).









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









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









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









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









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









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









For row 3, number 9 is only possible in cell (1,3)









For row 7, number 9 is only possible in cell (5,7)









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









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









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









For column 8, Number 7 is only possible in cell (8,1)









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









For row 6, number 9 is only possible in cell (8,6)









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









For row 2, number 6 is only possible in cell (7,2)









For row 8, number 6 is only possible in cell (5,8)









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









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









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









For box 2, candidates for 5 are all in column 5, so you can remove candidates from other blocks.









For blocks 1 and 3, candidates for 2 are all in the same two rows (1 and 2)









For blocks 1 and 7, candidates for 4 are all in the same two columns (3 and 1)









Hidden Pair for 1 and 6, can remove other candidates from these cells.









X-Wing in columns for 2.









Number 8 is the only value possible in cell (5,9).









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









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









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









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









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









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









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









Number 8 is the only value possible in cell (4,5).









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









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









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









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









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









Number 4 is the only value possible in cell (5,1).









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









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









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









Number 4 is the only value possible in cell (9,5).









Number 8 is the only value possible in cell (2,6).









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









Number 2 is the only value possible in cell (4,7).









Number 5 is the only value possible in cell (4,8).









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









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









Number 7 is the only value possible in cell (2,5).









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









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









Number 4 is the only value possible in cell (3,9).









Number 3 is the only value possible in cell (4,9).









Number 2 is the only value possible in cell (7,9).









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