its not a maths related at all
the concept is like this
its a 9 by 9 row, a total of 81 small boxes
use only numbers from 1 to 9
for each and every horizontal and vertical rows, the number 1 to 9
can only appear once..
this also applies to the small 3 by 3 box.
when completed, you will see that each rows, left to right, top to
bottom and the 3 by 3 box, the number 1 to 9 only appears
once..
there are different difficulities to this game... easy lvl can be
completed below 8 min..
the hardest lvl i play, took me 3 hours...
not that i took full 3 hours, but it took me very long time to
complete..
but its fun
