Astraware Sudoku - It's a different kind of Zen

Step-By-Step Solution:

Initial Grid

                    
First step - add in all possible valid pencilmarks.




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









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









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









For row 7, number 4 is only possible in cell (5,7)









For box 8, Number 3 is only possible in cell (5,9)









For column 6, Number 4 is only possible in cell (6,4)









For column 6, Number 3 is only possible in cell (6,6)









For row 3, number 6 is only possible in cell (5,3)









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









For box 5, candidates for 7 are all in row 4, so you can remove candidates from other blocks.









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









For box 5, candidates for 9 are all in column 5, so you can remove candidates from other blocks.









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









Candidates for 8 in boxes 1 and 3 force the candidates in box 2 to be in the remaining line.









Naked Pair for 2 and 9, can remove these as candidates from other cells.









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









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









For row 6, number 8 is only possible in cell (2,6)









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









For box 4, Number 6 is only possible in cell (1,6)









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









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









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









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









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









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









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









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









For row 3, number 4 is only possible in cell (8,3)









For column 7, Number 1 is only possible in cell (7,6)









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









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









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









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









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









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









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









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









Number 3 is the only value possible in cell (8,2).









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









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









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









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









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









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









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









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









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









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









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









Number 8 is the only value possible in cell (3,1).









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









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









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









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









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









Number 2 is the only value possible in cell (6,3).









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









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









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









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









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









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