The definite article in English is the, for both singular and plural nouns. The definite article points to a specific instance of a thing. For the first instance in which an indefinite or general thing is referred to, an indefinite article is used. The next time that same thing is referred to, the definite article is used, even within the same sentence.

If a game allows a player to perform an action, the player expects to be able to perform the action across the whole game.

[For constructions like “The higher the temperature, the worse the humidity feels” (Swedish “Ju… desto…”), see Correlative pairs: the / the.]