Somehow stumbled here and seems fun so here goes,

First Line : 1-4-2 (one number is well placed)

• By looking at 3rd line : 4-5-6 (nothing correct) thus we can eliminate 4 from first line
• By looking at 4th line : 1-3-9 (one number correct but wrongly placed) note that if we accept 1 in the first line as well placed, then 4th line will have at least 1 well place number as well yet was not stated so, therefore we can eliminate 1.

Thus we have 2 as the well placed,
?-?-2, and the code is easily solved with hint from 2nd line

3-0-2

Also you made a typo with the last post final answer i think? XD