What is mercenaries?

A mini-game which has appeared in previous Resident Evil titles. The aim is to kill as many enemies within the given time limit. You get various maps to go in, and at the end you get a score and ranking.

How do I unlock it?

Beat the game once.

Who do I play as?

You start with good old Leon. But you can unlock the following characters;

HUNK
Ada Wong
Jack Krauser
Albert Wesker

How do I unlock them?

They are all unlocked by achieving a 4-star ranking on a certain map.

Village - Ada
Base - HUNK
Castle - Krauser
Waterworld - Wesker

Who is the best to use?

Personally, I feel Krauser and HUNK are the best. I can use them most effectively. And their arsenal and other abilities allow you to kill opponents with ease. Of course this is my opinion.

So discuss.

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Wow, is this part of the extras thing? If so how long does it go about?

Not too long, it's just a mini game really. Not an extra scenario. :P

I tried a few times and did poorly lol

I suck sooooo badly at this mini game. I can't get a 4-star ranking on any stage with Leon. The highest I ever got was 3 stars on the military base. =\

The base is the easiest with Leon IMO, you just gotta hope you get shotgun ammo. :/

Yeah, it was my very first map where I got 3 stars. The biggest problem I encounter is the JJ's. The shotgun doesn't knock them down. =\

I got a 3 star ranking in Waterworld yesterday. If you start inside one of the
structures, you can easily get a ~20 streak there. The problem is, your streak could end once Dr. Salvador appears because if that's the case, get ready to run.

Who's Dr. Salvador? Just curious here lol.
I tried it 3 times. In the Village. And well. . .I got killed twice and a 1-star rating once. :/

Dr. Salvador is the name of the chainsaw enemies. I've finally unlocked all the characters. Wesker is by far my favorite. His arsenal is ludicrously powerful and he's an all-rounder; he has weapons for every situation.

I only like Wesker for a headshot/thrust punch combo.