In this situation though, "you play left" could be a valid translation. The "on the" is implied. For instance, you won't always say "you go to the left" but will just shorten it to "you go left": it has the same meaning.
So I wrote "y'all playing on the left." - But correct answer was "y'all play on the left." How do I know when to use play vs playing, doesn't 'spielt' mean the same or is this some type of context issue?