A 8137
B3 2 5
C 12
D 7 3 1
E94 67
F7 5 8
G 63
H 6 4 9
I 9321
When tackling a difficult puzzle most of the squares turn out straightforward to solve; it is usually only one or two squares that seem to defy solution.

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Welcome to this Sudoku Dragon guide. Use the bar alonside the grid to control it. The buttons let you Stop; Play; Rewind back to start; Go back a step; Go forward a step.