Hell Let Loose Vietnam is an FPS game that demands teamwork, with an incredibly satisfying loop for those who can beat the learning curve. Verdict Not one for the faint of heart, Hell Let Loose: Vietnam is a challenging FPS game that demands total teamwork at a minimum. Hell Let Loose: Vietnam is pretty special - sometimes. Ditching Europe for Southeast Asia, Hell Let Loose: Vietnam takes on one of the most divisive conflicts of recent times: the Vietnam War. The more you put into Hell Let Loose Vietnam, the more you get out of it.