Valentine;24447 said:
But it's the same difficulty, for EX: Nicholai has only a gun and knife but if you kill a Zombie you'll 24 sec+ and if you play as one of the others you'll get only 3 sec+
You only get 24 seconds if you have the knife equipped when the zombie dies.
With the handgun, Nicolai's kills are normal. With a knife, everything is multiplied by 8.
Also, there is a time limit on each of the survivors that won't be affected by you gaining extra time. Unfortunately, the kill time is so long with a knife that by the time you get to any of the survivors, they're often already dead.
I've gotten an A rank with Mikhail many times. I've never managed to rescue all of the survivors with Carlos, because while he has the assualt rifle and enough health to survive, it's difficult to keep getting more time, since you don't have the ammo or the types of weapons that can kill multiple enemies in quick succession to get some good time boosts.
I've made it to the end with Nicolai, but like Hell can I rescue all the survivors.