Learn Farsi: خود گذرگاه معماهایی نظیر پازل‌های سخت دارد. - The passageway itself has puzzles such as hard jigsaws.

nazir-e means 'such as' or 'like' and introduces specific examples of a broader category. You can absolutely use az qabil-e here instead without changing the meaning. Both link directly to the noun phrase that follows and are slightly more formal, written alternatives to the everyday word mesl-e (like).

Why does mo'amma-ha (puzzles) have an extra -yi suffix at the end?

The -yi suffix makes the plural noun indefinite, meaning 'some puzzles' or 'puzzles of a certain kind'. When you give examples using nazir-e or az qabil-e, the broader category noun before it very often takes this indefinite suffix to show you are talking about an unspecified subset.

How does khod work at the beginning of this sentence?

While khod is commonly used as a reflexive pronoun ('oneself'), placing it before a noun and linking it with an ezafe (khod-e gozargah) is how you add emphasis. Here it translates to 'the passageway itself', highlighting the passageway as opposed to the rooms or areas around it.

What is the difference between mo'amma and pazel if both can translate to 'puzzle'?