When to use dans, or à for translating the word "at"

[jovial skiff]

Why is dans being used instead of à to translate the word "at" in this context?

[junior tide]

It says "in the park" in the English prompt

the "at" is part of the phrase "what are they playing at?"

[shadow harness]

I would say use "à" when referring to being at a place or location, usually for things like cities, islands or general areas.
Use "dans" when referring to being inside a specific space or within something (e.g. dans la maison, dans la boîte)
So, "à" is for general locations, and "dans" is for enclosed or specific spaces

[cold jay]

'What are they playing at + in the park?' not 'What are they playing + at the park?'

[shadow harness]

I misunderstood the question

[cold jay]

dw OP misunderstood it as well