not very easy for newbie as a 7kyu kata if didn't get a clever trick

Oh, I am so careless about the condition, yes, it is a necessary but not enough condition. Thanks! It is really a hard kata

according to kata description:
Note: The minimum of givens required to create a unique (with no multiple solutions) sudoku game is 17.

so the first one should have unique solution, for it has 29 givens (>17), why there are multiple solutions?

original puzzle is valid, and solvable, and > 17 givens, so it should pass the test. maybe the description is somewhere wrong

ruby random test:
puzzle:
[[8, 0, 0, 5, 0, 0, 0, 0, 3], [0, 0, 5, 0, 6, 0, 1, 0, 0], [7, 0, 0, 0, 0, 1, 0, 2, 4], [0, 5, 0, 0, 8, 0, 3, 0, 0], [1, 0, 0, 0, 0, 0, 2, 0, 7], [0, 0, 7, 0, 2, 0, 0, 4, 0], [5, 7, 0, 3, 0, 0, 0, 0, 6], [0, 0, 3, 0, 4, 0, 7, 0, 0], [4, 0, 0, 0, 0, 5, 0, 0, 9]]
my solved:
[[8, 2, 1, 5, 7, 4, 6, 9, 3], [3, 4, 5, 2, 6, 9, 1, 7, 8], [7, 9, 6, 8, 3, 1, 5, 2, 4], [2, 5, 4, 9, 8, 7, 3, 6, 1], [1, 3, 9, 4, 5, 6, 2, 8, 7], [6, 8, 7, 1, 2, 3, 9, 4, 5], [5, 7, 8, 3, 9, 2, 4, 1, 6], [9, 1, 3, 6, 4, 8, 7, 5, 2], [4, 6, 2, 7, 1, 5, 8, 3, 9]]
why Value is not what was expected??? many random test in ruby seems uncorrect.

[[3, 0, 0, 0, 0, 5, 0, 0, 8], [0, 0, 1, 0, 6, 0, 5, 0, 0], [4, 2, 0, 1, 0, 0, 0, 0, 7], [0, 0, 3, 0, 8, 0, 0, 5, 0], [7, 0, 2, 0, 0, 0, 0, 0, 1], [0, 4, 0, 0, 2, 0, 7, 0, 0], [6, 0, 0, 0, 0, 3, 0, 7, 5], [0, 0, 7, 0, 4, 0, 3, 0, 0], [9, 0, 0, 5, 0, 0, 0, 0, 4]]
[[3, 9, 6, 4, 7, 5, 1, 2, 8], [8, 7, 1, 9, 6, 2, 5, 4, 3], [4, 2, 5, 1, 3, 8, 6, 9, 7], [1, 6, 3, 7, 8, 4, 9, 5, 2], [7, 8, 2, 6, 5, 9, 4, 3, 1], [5, 4, 9, 3, 2, 1, 7, 8, 6], [6, 1, 4, 2, 9, 3, 8, 7, 5], [2, 5, 7, 8, 4, 6, 3, 1, 9], [9, 3, 8, 5, 1, 7, 2, 6, 4]]
Value is not what was expected

thanks for notice where i am wrong

should be: 3 - Expected: 3, instead got: 1
error in 1001 in ruby

[40,29,13,21,31,10,49,40,40,4]
for first 40, 40 % [40,29,13,21,31,10,49,40,40,4].size == 0, so 40 is alone in result arr,
but for nex 29, why 29 is alone??? it is not 29 % [29,13,21,31,10,49,40,40,4].size = 29 % 9 = 2,
so [29, 13] is result??? at this moment should get [40,[29,13],21,31,10,49,40,40,4]
it is not a good description for this kata, making so confused

Some test is wrong for ruby

confused description, need explain more clearly

maybe it is not a complete newbie kata for 7kyu, actually, i think it need some skill to do this, should about 5.5 kyu

actually, i can't understand well this kata, so confused

ruby is down

it is a little confused by the description

This should change to 6 or 5 kyu

It should be a 4kyu, not 6kyu data i think