watasitati ha kyouryokugatageemu wo erabu.

It is read:

わたしたち は きょうりょくがたゲーム を えらぶ。
Romanized: watashitachi wa kyōryokugata gēmu o erabu

A few pronunciation notes:

• 私たち = わたしたち
• は is written ha but here it is pronounced wa
• 協力型 = きょうりょくがた
• ゲーム = gēmu
• を is usually pronounced o
• 選ぶ = えらぶ

は marks the topic of the sentence.

So 私たち は means something like:

• As for us, ...
• We, ...

In this sentence, 私たち is the topic, and the sentence then tells you what is true about that topic: we choose a cooperative game.

This is one of the most common sentence patterns in Japanese:

• [topic] は [rest of sentence]

When は is used as the topic particle, it is pronounced wa.

So:

• as a normal syllable in a word: ha
• as the particle は: wa

This is just one of the standard spelling-pronunciation differences you have to memorize in Japanese. Another common one is を, which is written wo historically but pronounced o in modern Japanese.

を marks the direct object of the verb.

In this sentence:

• 協力型ゲーム = the thing being chosen
• を = marks it as the object
• 選ぶ = choose

So 協力型ゲーム を 選ぶ means:

• choose a cooperative game

A very common pattern is:

• [object] を [verb]

It is a noun phrase made of smaller parts:

• 協力 = cooperation
• 型 = type / style / form
• ゲーム = game

So 協力型ゲーム literally means something like:

• cooperation-type game
• cooperative-style game

In natural English, that usually becomes a cooperative game or a co-op game, depending on context.

Japanese often builds long noun compounds like this, where several elements come before the main noun.

Because ゲーム is a loanword, borrowed from English game.

Katakana is commonly used for:

• foreign loanwords
• some sound effects
• emphasis
• certain technical or modern terms

So ゲーム is the standard Japanese way to write game.

選ぶ is the dictionary form of the verb.

This form can express:

• a general statement
• a habitual action
• present/future meaning depending on context

So 私たちは協力型ゲームを選ぶ。 could mean:

• We choose a cooperative game.
• We will choose a cooperative game.
• We choose cooperative games.

Japanese does not always mark tense the same way English does. Context tells you whether it feels more like present, habitual, or future.

Because Japanese normally puts the verb at the end of the sentence.

So the basic order here is:

• 私たち は = topic
• 協力型ゲーム を = object
• 選ぶ = verb

Japanese is often described as SOV or topic-based, unlike English, which is usually SVO.

English:

• We choose a cooperative game.

Japanese:

• We / cooperative game / choose

That final verb position is one of the biggest word-order differences from English.

Yes, very often.

Japanese frequently leaves out subjects or topics when they are obvious from context. So in a real conversation, you might simply hear:

協力型ゲームを選ぶ。

That could still mean We choose a cooperative game if the context already makes we clear.

Japanese tends to avoid stating pronouns unless they are needed for clarity, contrast, or emphasis.

This is a very common learner question.

In this sentence, は makes 私たち the topic:
As for us, we choose a cooperative game.

If you used が instead, it would sound more like you are specifically identifying we as the ones who choose it, often with a sense of contrast or emphasis:

• 私たちが協力型ゲームを選ぶ。
  = We are the ones who choose the cooperative game.

So:

• は = topic, more neutral/general in many cases
• が = subject marker, often more specific or focused

Both can be grammatical, but they create different nuances.

Yes, it is grammatical and understandable.

A couple of nuance points:

• 協力型ゲーム sounds like a cooperation-type game or co-op style game
• Depending on the context, a native speaker might also say something like 協力ゲーム for cooperative game

But your sentence is perfectly fine as a learning example because it clearly shows:

• topic with は
• object with を
• verb in dictionary form at the end

So it is a good sentence for studying basic Japanese structure.