It's a free game, so I expected it to be a quick 30 minutes of fun... But after initially playing it non-stop of a few hours, I soon realised that this is a real gem of a game. It stays true to the classic zombie genre with the slow walking zombies but it has it's fair share of "runners" too. The atmosphere is very dark and gritty, it's perfect for zombies and I love it. There's dozens of weapons ranging from guns to melee. There's always room for trying new strategies for the hordes of undead. There's a modest number of maps but each map has a changing structure that makes it different each playthrough. And both objective and survival gamemodes are equally fun. But as a personal opinion, objective maps are too easy as sometimes you can pretty much speedrun your way through the map and leave everyone behind with the zombies. Overall, it's a perfect zombie game and hearing the accompanying "pop" when you blow a zombies head off is pretty damn awesome. Compared to the L4D series, I'd say NMRIH is more realistic so it gets my preference in this genre. Give it a try, it's worth many hours of zombie killing.