DICE product manager Tommy Rydling has revealed a few new details about Battlefield 3's co-op mode, which was first revealed at GamesCom earlier this month.
Speaking to the PlayStation Blog, he said co-op has been designed to be "the perfect blend between the strong narrative from single player and the open-ended action from multiplayer.
"We are fusing the replayability of multiplayer with a pick up and play mentality to create a totally new flavour of Battlefield," he added.
Rydling said the game's co-op missions are largely asymmetric. "This means that one mission can have you piloting a helicopter while your friend is the gunner, for example. Other situations have one player disarming a bomb and the other one defending him. Or (as you could see in our press conference playthrough at GamesCom) you can do tandem kills to avoid detection." The mission demoed at GamesCom was called Exfiltration and revolves around a defecting informant, El Zakir, who players have to escort to safety.
Players will take on the role of soldiers not tied to any particular Armed Forces branch, allowing for "a vast variety in gameplay in the different co-op missions". They'll also be able to revive a fallen comrade, who'll be able to wield a secondary weapon while bleeding out.
Rydling said co-op difficulty "is high", explaining: "We are definitely going for a tough challenge in all missions. Also, since competitive players will likely try each mission several times, all of the co-op missions contain randomised elements to keep every playthrough fresh.
"Clearing the co-op missions not only gives you scores and bragging rights - it also has benefits for your multiplayer career. There are a number of weapons that you can unlock in co-op and take with you to the regular multiplayer modes. These unlocks are based on your combined scores accumulated throughout the co-op campaign."
DICE general manager Karl Magnus Troedsson said earlier this month there'll be six co-op missions when the game launches in October.
They'll be unconnected to the main campaign, although they'll share some environments, there'll be different difficulty levels and achievements, and each map should take between 20 and 50 minutes to complete.