Ova soba za bijeg je teška.

Because ova has to agree with soba.

• soba = a feminine singular noun
• ovaj = masculine singular
• ovo = neuter singular
• ova = feminine singular

So:

• ovaj stol = this table
• ovo selo = this village
• ova soba = this room

Croatian demonstratives agree with the noun in gender, number, and case.

Because soba is the subject of the sentence, so it is in the nominative case.

In Ova soba za bijeg je teška, the subject is ova soba za bijeg = this escape room.

Compare:

• Ova soba je velika. = This room is big.
  → subject, so soba is nominative
• Vidim sobu. = I see the room.
  → direct object, so sobu is accusative

So here soba stays soba because it is the thing being described.

Literally, it means room for escape.

Breakdown:

• soba = room
• za = for
• bijeg = escape

So soba za bijeg is the Croatian way of saying escape room.

This is a normal Croatian structure: noun + za + noun can express purpose.

Examples:

• čaša za vodu = glass for water
• torba za laptop = bag for a laptop
• soba za bijeg = room for escape / escape room

After za in this meaning, Croatian normally uses the accusative case.

So bijeg here is accusative singular.

The tricky part is that bijeg is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative looks the same as the nominative.

So:

• nominative: bijeg
• accusative: bijeg

That is why you do not see a form change.

In standard Croatian, you normally keep je in sentences like this.

• Ova soba za bijeg je teška. = This escape room is difficult.

Here je is the 3rd person singular present form of biti = to be.

Croatian can sometimes omit forms of to be in very informal speech, headlines, or special styles, but for normal learners, the safe rule is:

• in present-tense descriptive sentences, use je

So Ova soba za bijeg teška would usually sound incomplete or nonstandard to a learner.

Because the adjective must agree with soba, which is feminine singular.

The adjective težak changes form depending on gender:

• masculine: težak
• feminine: teška
• neuter: teško

So:

• težak zadatak = a difficult task
• teška soba = a difficult room
• teško pitanje = a difficult question

Since soba is feminine, the correct form is teška.

It can mean both, depending on context.

• težak / teška / teško can mean heavy
• it can also mean difficult / hard

In this sentence, with escape room, the natural meaning is difficult.

Examples:

• Torba je teška. = The bag is heavy.
• Ispit je težak. = The exam is difficult.
• Ova soba za bijeg je teška. = This escape room is difficult.

So Croatian uses the same adjective where English often separates heavy and difficult.

Yes, it is a common and understandable Croatian expression.

You may also encounter borrowed or more commercial-looking forms, especially in advertising, such as:

• escape room
• escape soba

But soba za bijeg is a clear native-style Croatian phrase and is perfectly good.

A learner should definitely understand and be able to use it.

Yes. Croatian word order is more flexible than English word order.

The neutral order here is:

• Ova soba za bijeg je teška.

But you could also hear:

• Soba za bijeg je teška. = The escape room is difficult.
• Teška je ova soba za bijeg. = This escape room is difficult / This escape room is a hard one.

Changing the order usually changes emphasis, not the core meaning.

For learners, the original order is a very safe and natural pattern: demonstrative + noun phrase + je + adjective

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

So Croatian often expresses:

• soba = room / a room / the room
  depending on context

In your sentence, ova already makes the phrase specific:

• ova soba = this room

That is why no article is needed.

These are all demonstratives, but they point to things differently.

• ova = this
• ta = that
• ona = that over there / that one

So:

• ova soba = this room
• ta soba = that room
• ona soba = that room over there

In practice, ova is used for something close to the speaker, physically or mentally.

A simple learner-friendly guide:

• teška ≈ TESH-kah
• bijeg ≈ BYEG or bee-YEG, depending on how carefully you pronounce it

A few useful points:

• š sounds like English sh
• j sounds like English y
• g is always a hard g, as in go

So:

• teška → teh-shka
• bijeg → bee-yeg

Croatian spelling is quite regular, so once you know the sound values of the letters, pronunciation becomes much easier.