ahahaha yeah I thought so too and then I realised I don't know how sudoku wokrs lol

In sudoku also 3x3 grid can not have the same numbers

The whole thing is a 9x9 grid, which is made of 9 3x3 grids, in which all 9 numbers also have to be different

Hi @Gates_TN - check the top left 3x3 square of this grid: there are repeated 2's, 3's, 4's.

[1, 2, 3, 4, 5, 6, 7, 8, 9] ,  # <-- 123 first 3 entries
[2, 3, 4, 5, 6, 7, 8, 9, 1] ,  # <-- 234 first 3 entries
[3, 4, 5, 6, 7, 8, 9, 1, 2] ,  # <-- 345 first 3 entries
[4, 5, 6, 7, 8, 9, 1, 2, 3] ,        ^^^ 
[5, 6, 7, 8, 9, 1, 2, 3, 4] ,        3x3 square with repeated 
[6, 7, 8, 9, 1, 2, 3, 4, 5] ,            2's, 3's, 4's
[7, 8, 9, 1, 2, 3, 4, 5, 6] ,
[8, 9, 1, 2, 3, 4, 5, 6, 7] ,
[9, 1, 2, 3, 4, 5, 6, 7, 8]

i think the last test should be True expected not false!
test.assert_equals(valid_solution([[1, 2, 3, 4, 5, 6, 7, 8, 9]
,[2, 3, 4, 5, 6, 7, 8, 9, 1]
,[3, 4, 5, 6, 7, 8, 9, 1, 2]
,[4, 5, 6, 7, 8, 9, 1, 2, 3]
,[5, 6, 7, 8, 9, 1, 2, 3, 4]
,[6, 7, 8, 9, 1, 2, 3, 4, 5]
,[7, 8, 9, 1, 2, 3, 4, 5, 6]
,[8, 9, 1, 2, 3, 4, 5, 6, 7]
,[9, 1, 2, 3, 4, 5, 6, 7, 8]]), False);