You should check the each 3x3 square too!

There are already open issues about incomplete tests, there's no point in raising new ones.

(Nvm got it, thx!)

In c my solution was accepted, even if i checked only for blocks correctness,

{{1,2,3,1,2,3,1,2,3},
{4,5,6,4,5,6,4,5,6},
{7,8,9,7,8,9,7,8,9},
{1,2,3,1,2,3,1,2,3},
{4,5,6,4,5,6,4,5,6},
{7,8,9,7,8,9,7,8,9},
{1,2,3,1,2,3,1,2,3},
{4,5,6,4,5,6,4,5,6},
{7,8,9,7,8,9,7,8,9}}

should return false but my code returns true, in spite of this I passed all the tests.
please add check for row/column number repetition

Look at the last column of the first screenshot (btw, post them as formatted text ordered, not like that, it's hard to read).

In the second one, the blocks are wrong.

and are correct in my opinion, does anyone know why is it expected to be false?

This is not a kata issue. A question maybe.