Learn Swedish: Det gäller att knäcka gåtan genom att samarbeta. - It is crucial to crack the riddle by cooperating.

While both express necessity, det gäller att specifically means it is crucial to or it all comes down to doing something. It implies that this action is the absolute key to achieving success (solving the riddle), rather than just stating a general rule or strict obligation like måste does.

Why does the Swedish sentence use att samarbeta (to cooperate) instead of a word ending in '-ing' like the English 'cooperating'?

Swedish does not have a direct equivalent to the English '-ing' form (the gerund) to use after prepositions. Instead, whenever you want to say 'by doing something' in Swedish, you always use the phrase genom att followed directly by the infinitive form of the verb.

Is knäcka used exactly like 'crack' in English?

Yes, it matches almost perfectly! You can use knäcka for abstract challenges like cracking a code, a difficult case, or a riddle (en gåta), as well as for physical actions like cracking a nut or snapping a branch in half.

If I want to emphasize the cooperation and start the sentence with Genom att samarbeta, how does the word order change?