Impossible is winnable, I have managed to do it twice out of about 50 tries. I play on huge maps, and this may be an advantage as hordes can take up to 6 days to reach you - but once you really expand the hordes catch you pretty quick. Both victories were Last Judgement kills with strength as the focus, though I think the leader ot builder victories would be just as obtainable if the city hall/heliport was found.
Impossible is my fav because it actually limits the time of the game pretty good. By 20 turns you know how you are doing, and it is usually not good. ;> Luck always plays a part in impossible, especially when you take risks.
I also play v 1.4 on Kongregate. 1.3 was crashing/freezing on me.
Regarding guard duty, I don’t see the benefits to the guard house other than a holding tank. It says anyone not assigned is considered on guard duty. I only see benefits in zombie raids.
And you want regular raids - it thins things out and keeps your zombies low. I am not sure if the strength of your guarding force adds to the reduction of z’s after a raid. It should imho.
I have employed certain strategies, which I will mention below, and could contain spoilers
- I am very agressive the game and especially the first turns. No one stays home as they are wasted if no z’s attack. Killiing z’s keeps the risk down too. Kill zombies, get a hospital pronto. recruit to max, keep getting more farms and housing.
-Clear a police station early, but do not take it. Instead, scavange every turn. It yields you weapons and happiness till it runs dry. Also scavange all fruit (because you have to have more dudes than your food can afford. Scavaging makes up for loss of food and happy’s. Also extra unused items scavanged gets you food from the trader - which allows over recruiting. Also, weapons on newboes make a difference.
-Keep the risk rate below 25% later in the game, preferably 15% early. or be in a position to accept some damage/loss
–research zombie kill track before the others. I actually have never managed to do too much research in impossible, but help killing z’s is important.
-always invite the evil scientist, allow the book but never keep a church from what I have experienced.
-Bars are a waste of time. 5% if you claim it, -5% if you lose it, no other benefit I have found (not waiting for happy hour).
-Build reclaim teams that can take areas in one turn and upgrade malls in two. Looks like you need around 13 hammers to do this. when z takes areas, you can quickly recover.and do last minute reclaims on defensive buildings.
–scout and scout more. Looking for the paths to the buildings you most need.
-when going to kill zombies, do not send your best dudes, start from the bottom. This is like sending them to soldier school with the added benefit of reducing the count and clearing an area for easy scavange or reclamation.
–keep recruiting, this is the only way you feebly keep up with the growing horde.