Amazing work, worth of its 5/5 vote and 4 stars. Reason i don't give it a 5 stars is mainly because it has such a potential story-wide and yet does nothing with it. A shame. But that aside, it's really a well thought and addictive game. There's also the problem of some glitches here and there. For instance, controls get rigged at times, in a lag-like manner, causing the hero to move on its own according to the key pressed just before it started lagging and ignoring new ones, often causing death. Another glitch is the spawn and travel path of NPCs, on some map they will spawn off map (area 5, factory & shelter capture, there is a friendly NPC that is completly unreachable, north east of the map corner), and others will spawn and move inside building blocs, becoming invulnerable in the process until they get back in map. Once i even had a zombie roamer that fled me that way, leaving the map pure and simple...
I'm also a bit disapointed, i completed the mission in the Massacre battlefield (the southern battlefield with the zombie god troll) with all objectives achieved, yet it seems the battlefield can't be silenced and turned green. Same for the other battlefield, with the second super mutant boss. Would have been interesting to have a way to turn the entire city green... ;)
I may still have
**** ALERT : HELPING GUIDE AHEAD ! ****
For those having trouble with the threat management, my advice : don't invade all zones in a row. A zone will turn green once you've built all red upgrades in all building it has, result of which will be no attack and no threat generation. From that, if you choose the upgrade order right, you can keep 0 threat for quite a while, until reaching the factory upgrades in fact.
Here's what i do : i only invade a new zone once i have at least 20k credits, 4 soldiers and 1 civilian in my team. This allows me to complete the shelter (remember you need the outpost to grab the red shelter upgrades) and have no threat generation early. Then i go for the yellow and special upgrades of the outpost, as you won't get any siege attempt as long as you have no red upgrade on the outpost. Then, the red outpost upgrade to bring my threat generation decrease to the max, and then i do the red factory upgrades, doing the -frontier outpost mission to clean the threat they generate. Once that's done, the area is green, leaving me plenty of time to purchase the other factory upgrades as well as the inspector upgrades without having to care about ennemy attacks.
As for recruiting survivors, at first do the explore 1 mission of the starting area, but as soon as you get to invade a new area choose the one north to the starting one : its own explore 1 mission houses tons of survivor, and as such is a golden opportunity for survivor grinding until the end of the game. Did not get the ones you wanted ? Go back for some more ! Just keep an eye on threat levels of other areas that you may not have turned green yet.
Hope you'll enjoy even more the game now. ;)