This sentence can be rewritten in a formal way such that it retains the same meaning thus:
Formal language is a way of writing without slang. This form of writing can be used in an official setting.
In the informal form of the sentence written above, important details about the new game include its description as sick, the fact that it is new, and the fact that it came out yesterday.
All of these details were included in the formal language.
Therefore, a correct way to rewrite this sentence is to say; "I found a sick, new game that just came out yesterday."
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