Zagonetka je iz drugog doba.

Je is the 3rd person singular present tense of biti (to be).

So the sentence structure is:

• Zagonetka = the subject
• je = is
• iz drugog doba = from another/different age or era

A very literal breakdown is:

• Zagonetka = riddle
• je = is
• iz drugog doba = from another era/age

Zagonetka is in the nominative singular, because it is the subject of the sentence.

It is also a feminine noun. The ending -a often signals feminine nouns in Croatian, though there are exceptions.

So here:

• zagonetka = nominative singular feminine
• it answers What is from another age? → The riddle

Iz usually means from or out of, and it requires the genitive case.

In this sentence, iz is used in a more figurative sense:

• iz grada = from the city
• iz škole = from school
• iz drugog doba = from another age / from a different era

So even though no physical movement is involved, Croatian still uses iz to show origin in time, style, or period.

Because iz requires the genitive case, and drugi has to change form to match that.

Here, doba is neuter singular, so the adjective must also be neuter singular genitive.

That gives:

• nominative: drugo doba
• genitive after iz: iz drugog doba

So:

• drugi = base dictionary form, usually masculine nominative singular
• drugo = neuter nominative singular
• drugog = masculine/neuter genitive singular

This is why drugog is the correct form here.

Good question: iz does take the genitive, but doba is one of those nouns whose genitive singular looks the same as the nominative singular.

So:

• nominative: doba
• genitive: doba

The case is still genitive, even though the form does not visibly change.

You can tell it is genitive because:

1. iz requires the genitive
2. the adjective changes to drugog, showing the case clearly

So iz drugog doba is definitely genitive, even though doba itself looks unchanged.

Here it means another or different, not second.

The adjective drugi can mean:

• second
• other / another

In a phrase like iz drugog doba, the natural meaning is from another age/era, not from the second age.

Context usually makes this clear.

Because Croatian does not have articles like English a/an and the.

So zagonetka can mean:

• a riddle
• the riddle

Which one is meant depends on context.

That is very normal in Croatian. Learners coming from English often expect an article, but Croatian simply does not use one.

Both can relate to time, but they are not used in exactly the same way.

• doba = age, era, period
• vrijeme = time in a broader sense, and also weather

In this sentence, doba is the natural choice because the idea is an era or a period in history/style.

So:

• iz drugog doba = from another era
• vrijeme would not sound as natural here if you mean age/era

Yes, Croatian word order is more flexible than English word order, but the neutral, standard order here is:

Zagonetka je iz drugog doba.

You might rearrange it for emphasis, for example:

• Iz drugog doba je zagonetka.

But that sounds more marked or stylistic. A learner should usually stick with the neutral order unless there is a reason to emphasize something.

Yes. It is a natural expression for saying that something seems to come from another era, whether literally or stylistically.

It can describe something that feels:

• old-fashioned
• outdated
• ancient in style
• from a different historical period

So even if the sentence is simple grammatically, the phrase itself is quite idiomatic and useful.