Problems mean more problems, things that are difficult to solve, and have nothing to do with puzzles. . I'm just saying something is wrong. It's hard to handle. Can you understand? I understand the meaning, but I can't make it clear. .
Puzzle, when used as a noun, is basically no different from counudrum, and often indicates a mathematical problem. But it is mostly used in intransitive verbs, which means confusion. ...
For example, I was angered by his failure to reply.
I don't know much about grammar, just a conclusion drawn from my application. But don't worry too much about this. If you say it, you won't pay attention to the difference between these words. You can say it anyway. If it is an exam, it is not the point.