Resident Evil 6 PC will be the recipient of a free Siege Mode when it releases in March.
Siege is an online multiplayer mode for two to six players, in which a "lone AI-controlled rookie BSAA agent" is in trouble and in need of help.
Players will split into two teams: one will assume control of enemy creatures; the other team using playable characters from the main game. Creatures will try to kill the poor rookie, while the character team will try to save him.
Each game consists of two rounds with teams switching between the human and enemy roles.
Next month, PC users will be able to check out how the game will run on their system via a benchmark test.
All four post launch game add on modes - Survivors, Predator, Onslaught, and Siege - will be available for free download on PC.
The new Siege Mode will be available in March for Xbox 360 and PS3, priced for 320 MS Points/$3.99/€3.99/£3.19.
Survivors, Predator, and Onslaught game add ons will be made available on PS3 in February for $3.99/€3.99/£3.19 each.
Resident Evil 6 will be available as a digital download in North America March 22, and in Europe at retail and through digital the same day.
A video of Siege Mode is below, and an absolute truck load of screenshots are below, showing off the PC version of the game, along with the new Siege Mode and Mercenaries: No Mercy.