Metro 2033 is a survival horror first-person shooter video game, based on the novel Metro 2033 by Russian author Dmitry Glukhovsky. It was developed by 4A Games in Ukraine and released in March 2010 for Microsoft Windows and Xbox 360.
Metro 2033
The game is played from the perspective of Artyom, the player-character. The story takes place in post-apocalyptic Moscow, mostly inside the metro system, but occasionally missions bring the player above-ground.
Metro: Last Light
The game exists in the universe of the novel Metro 2033 and its sequels, written by Russian author, Dmitry Glukhovsky, but does not follow any direct storylines from the books. Previously announced as Metro 2034, the game is a sequel to the video game Metro 2033, and although Glukhovsky has apparently been working with the developers, it bears no relation to the book Metro 2034. Rumours on his website point to the upcoming book, Metro 2035, to be a novelisation of Metro: Last Light. Initially, the game was to be published under THQ and expected to be released in the middle of 2012;[6] it was announced on February 2, 2012, that the game would be delayed until the first quarter of 2013, and on March 1, 2013 the game was delayed again until May. Following THQ's closure in January 2013, the intellectual property was acquired by video game publisher Deep Silver. A PlayStation 4 version of the game has been announced. Although no release date was given, the developer has stated it will most likely not be a launch title for the platform.

Metro:Last Light takes place one year after the events of Metro 2033, proceeding from the canonical ending from the novel, ending where Artyom chose to call down the missile strike on the Dark Ones. Since the end of 2033, the Rangers have since occupied the D6 military facility, a huge pre-war bunker with miles of tunnels the Rangers have not yet fully explored. Thanks to his work in destroying the Dark Ones, Artyom has become an official Ranger. Despite the Rangers' best efforts, word of D6 has spread around the Metro that the facility has been found and it contains supplies that could sustain the Metro forever. Rumours point to rival factions pushing for war to take the supplies for themselves. Khan, the nomad mystic, arrives at D6 to inform Artyom and the Rangers that a single Dark One survived the missile strike. Khan believes the Dark One is the key to humanity's future, and wants to make peace with it, whereas the Ranger's leader, Colonel Miller, wants to kill the creature, ending the threat of the Dark Ones forever. Miller sends Artyom to the surface with a mission to kill the Dark One; he is accompanied by Anna, Miller's sarcastic daughter and the Rangers' best sniper.

Feel free to add more about both of the games, just don't spoil it because some(or most) of us haven't got to play it.

I love the Metro series by book and game. And I recommend it to anyone who's a fan of first-person shooter horror games.

Loved the first game but haven't had a chance to try/get the newest one but I have heard its amazing. The only real problem I had with the game is that in order to get it to even remotely try running on a semi-older computer you have to go through tedious manipulation to the settings. And even with the knowledge on how to do so I still couldn't pass a part because the game wouldn't recognize a key press/hold. Though a few months later I ended up getting a new laptop and it played beautifully. Also one really nice aspect that they continue to use which I think should be used more is instead of telling bonus story though bonus dialog ei. Bioshock's audio-logs, or Amnesia: The Dark Decent's notes and journals (though it does have a few just not everything is) it tells it through experience, meaning at one point if you wait a minute and look around places you might see something or someone you didn't expect to see.
Overall it's a great game with a really great interesting story.

Just bought Last Light, looks great.