Resident Evil 5/The Mercenaries

The Mercenaries is a score attack mode which is unlocked when you complete the game. To begin with, only two characters and one level will be available, but others can be unlocked by achieving sufficiently high scores.

Rankings
Your rank on any level is awarded based on the number of points you score. In a Duo (co-op) game, both players' combined scores are counted for the rank.

Depending on the rank awarded, you will receive a number of Exchange Points to spend on Bonus Features.

Chris (BSAA)
Unlocked automatically with The Mercenaries.

Chris (Safari)
Beat the Village stage with an A rank or higher.

Chris (S.T.A.R.S.)
Beat the Experimental Facility stage with an A rank or higher.

Sheva (BSAA)
Unlocked automatically with The Mercenaries.

Sheva (Clubbin')
Beat the Ancient Ruins stage with an A rank or higher.

Sheva (Tribal)
Beat the Missile Area stage with an A rank or higher.

Jill (BSAA)
Beat the Public Assembly stage with an A rank or higher.

Jill (Combat)
Beat the Ship Deck stage with an A rank or higher.

Wesker
Beat the Mines stage with an A rank or higher.

Wesker (S.T.A.R.S.)
Beat the Prison stage with an A rank or higher.

Stages
Each stage is unlocked by achieving a B rank or higher in the previous stage.