W grze kooperacyjnej razem używamy klepsydry i znaczników.

Because the preposition w usually requires the locative case when it means in.

So:

• gra kooperacyjna = a cooperative game dictionary form / nominative
• w grze kooperacyjnej = in a cooperative game locative

Both the noun and the adjective change:

• gra → grze
• kooperacyjna → kooperacyjnej

That is why the phrase looks different after w.

Because it has to agree with grze.

In Polish, adjectives agree with the noun in:

• gender
• number
• case

Here, gra is:

• feminine
• singular
• in the locative case after w

So the adjective must also be feminine singular locative:

• kooperacyjna → nominative
• kooperacyjnej → locative

This is normal adjective agreement.

Używamy is the 1st person plural present tense of używać = to use.

So it means:

• we use
• sometimes in instructions, more naturally, we use / you use in the sense of the players use

Polish often uses we in rules, manuals, and explanations where English might also say:

• we use
• players use
• you use

So this is a very natural form in game instructions.

Because Polish verbs usually already show the subject.

The ending -my in używamy tells you the subject is we.

So:

• używamy = we use

You could add my for emphasis:

• My używamy klepsydry...

But normally it is unnecessary, because the verb ending already makes it clear.

Because używać takes the genitive case.

That means the objects after używać are not nominative or accusative here, but genitive:

• klepsydra → klepsydry
• znaczniki → znaczników

This is one of the important patterns to learn with Polish verbs: some verbs require a specific case, and używać commonly takes the genitive.

Because they are different nouns with different grammatical patterns.

Here:

• klepsydry is probably genitive singular of klepsydra = hourglass / sand timer
• znaczników is genitive plural of znaczniki = markers / tokens

So the sentence suggests:

• one hourglass
• multiple markers

That is why the forms are different.

A rough breakdown:

• klepsydra → klepsydry
• znaczniki → znaczników

Different gender and number patterns produce different endings.

Yes, in a game context klepsydra usually means an hourglass or sand timer.

But you may also encounter klepsydra in another meaning in Polish, especially in older or more formal usage: it can refer to a funeral notice / obituary notice.

In this sentence, because it is about a game, the meaning is clearly hourglass / timer.

Razem means together.

It emphasizes that the players do the action jointly:

• używamy klepsydry i znaczników = we use the hourglass and markers
• razem używamy klepsydry i znaczników = together, we use the hourglass and markers

In a cooperative game sentence, razem fits very naturally because cooperation is the point.

It is not strictly necessary for the grammar, but it adds emphasis and meaning.

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

This sentence could be rearranged, for example:

• Razem używamy klepsydry i znaczników w grze kooperacyjnej.
• W grze kooperacyjnej używamy razem klepsydry i znaczników.

These versions are still understandable, but the original order sounds natural and clear.

The beginning W grze kooperacyjnej sets the context first: in a cooperative game. Then razem highlights cooperation. Then the verb and objects follow.

The natural adjective here is kooperacyjny / kooperacyjna = cooperative.

So:

• gra kooperacyjna = cooperative game

You might also hear gra oparta na współpracy = a game based on cooperation, but that is a different structure and less compact.

A form like w grze współpracy would not work for this meaning.

So for the standard board-game meaning, gra kooperacyjna is the normal phrase.

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

So w grze kooperacyjnej could mean, depending on context:

• in a cooperative game
• in the cooperative game

And klepsydry i znaczników could mean:

• an hourglass and markers
• the hourglass and the markers

The exact interpretation comes from context, not from articles.

Yes. Używać is the imperfective verb, and używamy is its present-tense form.

That fits well here because the sentence describes a general rule or ongoing way of playing:

• In a cooperative game, we use...

It is not talking about one completed action. It is describing a normal procedure, so the imperfective is the expected choice.

A perfective verb would not sound right for this kind of general instruction.