Does anyone know, would "Du spielst an der Rechts" work for this translation also?
shouldn't "sie spielen rechts" also be a correct translation, since the question does not specify a formal or an informal situation.
As long as "Sie" is capitalized, yes.
"Sie spielen rechts" should also be accepted as a correct answer. This should be corrected in the program and people should not be given an error for this!
Would "Du spielst nach rechts." work for this translation?
No, that would mean:"You play to the right."