How did naruto go 9 tails chakra mode?

It's around episode 280-290 or so when Naruto takes control of his dark half and thus controling the nine tailed fox completely so then on you will see that naruto has like a golden fire on hiim which is actually the Nine tailed fox if you're wondering when Naruto turns like into half human half biju like all the other jinchuuriki can do it would be when he fights Sauske in episode 260 and also when he fights Orochimaru in episode 317