:::::Firstly, I purposefully didn't look for sources stating that it's an open world game, since that doesn't need sourcing. It's a clear fact. 
 :::::Secondly, we don't need a source that strictly names the game an "open world Western action adventure"; if it's named "open world" by one source, "action adventure" by another, and "Western" by another, then that's enough. They don't need to use the entire quote, if that's what you mean.