[Tangram]

It is always a hard g, but the 'ng' sound is hard. There's less 'n' than in long, but...ah, it's hard to explain. If you just always use a plain g, that's fine, no one will call you out for it. But if you ever move to Japan or just speak to enough Japanese speakers, you'll eventually pick up that in some words, there's a definite 'n' influence.

From the listening exercises that I've done, I can say that sometimes there's enough 'n' to trip you up. If I'm not really familiar with a word, sometimes I can't tell if they're saying 'g' or 'n'.