Hit nail on the head

[Idiomaticus]

Hi. I need the info for a project of mine. There are pieces of a jigsaw puzzle thrown about on the floor. So, if you put all the pieces together in the proper way and get a whole picture, can you say that you hit nail on the head? I’m not sure whether that would be in the spirit of English language. Thanks for any opinion that you could give me, particularly if you’re 100% sure.

[Barb_D]

When you hit the nail on the head, you have given a response or offered an insight that is exactly right.

See here: Hit the nail on the head - Idiom Definition - UsingEnglish.com

It is not suitable to use for assembling a jigsaw puzzle.

[JMurray]

You might say that you nailed it.

[susiedqq]

"Solved the puzzle" is another idiom you can use.

[Barb_D]

Except it's literal and not idiomatic in this case, as is "able to see the big picture."