Another game that helped redefine 2D gaming.
The game takes place in 1986 during the world zombie outbreak.
This game has it all, zombies, an intensive narrative, more or less realistic combat, shortage of ammo, expansive and realistic environments, human conflict, back story, gore, puzzles. Once you beat the game you get the Nightmare mode unlocked, wherein you have to beat each of the three long acts (each with 4-5 scenes) without dying. Once you do so you unlock the alternate ending. This achievement is so hard that I haven't seen anyone on the net post the alternate ending yet.
One level I would take out is the one in the sewers, it was quite a torture I might say. Everything else looks great: detailed ambiance levels, the physics, the animation, the chase scenes, the cliffhangers, being outnumbered, using environment to kill foes, outstanding soundtrack. There are plenty of Easter eggs: such as three handheld video games, miscellaneous items, pieces that help complete the story as well as ID of famous serial killers and such. The game itself is also pretty long, around 5-6 hours..
Anyways, short review.