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Japanese Sudoku

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Select between Easy, Normal and Hard.
More difficult puzzles means less gained digits!
Your goal is to take into account these digits
and then fill the 9×9 grid so that each column, each row
and each of the nine 3×3 mini-grids
contains all digits from 1 to 9.
The timer helps you keep track
of time while you are solving the puzzle!
The hint button gives you one extra digit
to help you but it adds 1 minute to the timer.
And what does the solve button do? Well it solves the Sudoku!

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Nice graphics once playing, especially the animated birds while generating puzzle.
Is the (nice) music a recording or procedurally generated?
But multiple solutions can easily appear, there's no way to mark possiblities in empty squares, and no way to pause.

Nice

It is good and nice.....not much else.

quite hard

its very challing; just enough to make me like it.