First piece quest

Answer from: DarthYoda
You can use every weapon to this type of demons but it takes a veeeery long time to do it.

Answer from: headshot1180
Man thats impossible to kill those demons, i tried it and they took no damage!, the only way of killing them is to buy the flame gun which is VERY Expensive!!!!

Answer from: Maique
With the sniper gun u can take 2hp at a time, lots of bullets but cheaper than the flame thrower

Answer from: Witchkiller
It's possible. You can kill them easily with longshot repeater (it takes 3 hp in one shot)

Answer from: zombiecide
I just capped em all with the pump shotgun..that things a bad mambo jambo and Im waiting till level 36 to get the hand cannon.

Answer from: WildStrike
I so agree with headshot. it's easy to kill the normal demons but those final techno nerdy demons seriously take some time to kill. if you upgrade a dragon revolver up to max, then you can do some good dmg.

Answer from: IpsoNofacto
Ok, I am in the same issue, same level. couldnt afford the flame thrower, followed red line to cave tunnel. Fighting the lighting sparking enemies. On wave 3. have only used the 2nd level fully upgradded dragon revolver. Took me forever and running many circles around these Cobra Commander looking MoFo's and slowly killed them. Yet still on 3rd wave after all visible baddies are gone. Map shows one red dot outside of the spikes on one end of the tunnel. Game will not go any further til I dispatch this last dot, but he never ventures into the cave. Spikes keep me from going anywhere else. Glitch??? I think not, 4th time I have made it to this point. I kill all the ones that come into the cave, but how to do i get done. Why does this "shock-y" bastard hide? how can I lure him out into the cave.???

Answer from: Blade
You can kill the techno dudes with the duel guns mine are slightly upgraded and I only need the 3rd piece of the key now

Answer from: sixgunsace
Tesla gun and rail gun both do aboit 6 damage per shot +upgrade