Valve's first downloadable content for Left 4 Dead 2 was The Passing; an extra campaign to link the first Left 4 Dead game with the second. It features the old characters and a mix of the L4D1 and L4D2 graphical style to create a believable bridge between the games. The DLC is free for PC owners, but it costs 560 MS points for the Xbox 360.
I was excited about this when it was announced; being one to enjoy the story as much as the mass zombie killing I welcomed a link between the characters that I'd played previously and the newly introduced cast.
The actual result is a pretty mediocre story, with (as the name suggests) a brief meeting with the old characters, but a fresh gameplay experience with 3 large levels and varied environments.
The last level is a little tedious; a simple gas-can collection like the end of the first campaign, but the other two levels make up for that.
New achievements, a weekly "mutation" game mode and new uncommon-common infected along with a load of new dialogue and general story tidbits. Overall, this is a great new addition to the game.
