Left 4 Dead 2

The new special infected ---------

The Charger is an infected with a mutated, oversized arm, and can move quickly and knock players in its path off their feet. It can also grab players and smash them against the ground 2 deal major damage

The Spitter spit's phlegm that splatter across an area, eroding the survivors' health as long as they remain within it

The Jockey can jump onto the back of a survivor and steer them towards other infected or traps set by the game.

New game modes ----------

Scavenger mode has the 4 survivor characters scrambling 2 collect gas cans from various spots in a confined location in order 2 fuel up a generator before a two-minute timer expires. There are 16 cans total and 20 seconds are added to the clock for each one that's successfully retrieved. 4 other players, controlling Special Infected, must do their best 2 stop the cans from reaching the goal.

Realism mode Valve's Doug Lombardi explained that it was 4 the serious player: "Take Portal for example: We had our best internal players who could blow through that game in about 30 minutes, but within weeks of launching it we had people on YouTube beating [the testers'] times by 10 minutes or more. Realism is 4 those players."



Sources : Joystiq, Wikipedia hahahahahaha