Instruct: Classify Amazon reviews into positive or negative sentiment
Query: troubled and troubling

I bought and played "Nam" a couple years ago. This may be a revised version. I've also seen it sold as "Napalm".Nam is a first person shooter game based on the Vietnam war. Anyone familiar with the Duke Nukem series will recognize the 3D engine/environment.There are two game scenarios with multiple levels each. Perhaps I'm a bad player, but after I reached each of the last levels I couldn't get the game to end. Or perhaps that's supposed to be symbolic of something. Either way it was disappointing.As someone old enough to have served in Vietnam (but didn't) and to know people who did, I was troubled by the Viet Cong human targets.