user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: what is the left for dead 2 expansion? 
Knowledge Triplets: Dead Rising 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead State, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Rayman 2: The Great Escape, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Mercenaries 2: World in Flames, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Call of Duty: Modern Warfare 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Zombie apocalypse, cvg.computer_game_subject.games, Left 4 Dead 2
Kill Switch, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.09dy5sv
Hitman 2: Silent Assassin, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2: The Passing, cvg.computer_game_expansion.expansion_for, Left 4 Dead 2
The Dishwasher: Dead Samurai, base.wikipedia_infobox.video_game.platforms, Xbox 360
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
This Is Where I Want To Die, base.wikipedia_infobox.video_game.platforms, Linux
Sniper: Ghost Warrior 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode One, base.wikipedia_infobox.video_game.platforms, Mac OS
Mercenaries 2: World in Flames, base.wikipedia_infobox.video_game.platforms, Xbox 360
Valve Corporation, cvg.cvg_developer.games_developed, Left 4 Dead 2
Shelter 2, base.wikipedia_infobox.video_game.platforms, Linux
Dark Reign 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Man's Hand, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, cvg.computer_videogame.versions, Left 4 Dead 2
Deadlock: Planetary Conquest, base.wikipedia_infobox.video_game.platforms, Mac OS
Freddi Fish 2: The Case of the Haunted Schoolhouse, base.wikipedia_infobox.video_game.platforms, Linux
The Walking Dead, base.wikipedia_infobox.video_game.platforms, Xbox 360
Mob of the Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Killing Floor, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Shelter 2, base.wikipedia_infobox.video_game.platforms, Mac OS
No One Lives Forever 2: A Spy in H.A.R.M.'s Way, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Desperados: Wanted Dead or Alive, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Space, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.0z7_pv5
MechWarrior 2: Mercenaries, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Island, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dark Souls-Prepare to Die Edition, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Deathmatch Classic, base.wikipedia_infobox.video_game.developer, Valve Corporation
Half-Life 2, base.wikipedia_infobox.video_game.developer, Valve Corporation
Deadfall Adventures, base.wikipedia_infobox.video_game.platforms, Linux
Deathmatch Classic, base.wikipedia_infobox.video_game.platforms, Mac OS
Metal Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Harry Potter and the Deathly Hallows – Part 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Afterlife, base.wikipedia_infobox.video_game.platforms, Mac OS
Just Cause 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.09dy5pz
Half-Life 2: Lost Coast, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
BioShock 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Earthsiege 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Night of the Raving Dead, base.wikipedia_infobox.video_game.platforms, Xbox 360
All Zombies Must Die!, base.wikipedia_infobox.video_game.platforms, Xbox 360
m.09dy5mz, award.award_nomination.nominated_for, Left 4 Dead 2
Hell Yeah! Wrath of the Dead Rabbit, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.09dy5mz
Half-Life 2: Lost Coast, base.wikipedia_infobox.video_game.platforms, Linux
Deadlock: Planetary Conquest, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Test Drive Off-Road 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Bejeweled 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
TowerMadness 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Planet of Death, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Die Hard Trilogy 2: Viva Las Vegas, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Deadlight, base.wikipedia_infobox.video_game.platforms, Xbox 360
Death Track: Resurrection, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode Two, cvg.game_version.publisher, Valve Corporation
Left Behind: Eternal Forces, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Call of Duty: Modern Warfare 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Gangsters 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Lost Planet 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode Two, base.wikipedia_infobox.video_game.platforms, Linux
Guilty Gear 2: Overture, base.wikipedia_infobox.video_game.platforms, Xbox 360
DeathSpank, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead Rising 2: Off the Record, base.wikipedia_infobox.video_game.platforms, Xbox 360
Deadly Rooms of Death, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.0z7_ld8
Half-Life 2: Episode Two, cvg.game_version.developer, Valve Corporation
Valve Corporation, cvg.cvg_publisher.games_published, Left 4 Dead 2
Wasteland 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Still Life 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Final Fantasy XIII-2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Half-Life 2: Episode Three, cvg.game_version.developer, Valve Corporation
Divi-Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Mass Effect 2: Lair of the Shadow Broker, base.wikipedia_infobox.video_game.platforms, Xbox 360
Legacy of Kain: Dead Sun, base.wikipedia_infobox.video_game.platforms, Xbox 360
First-person Shooter, cvg.cvg_genre.games, Left 4 Dead 2
Dead or Alive Xtreme 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.09dy68k
Dead Rising 3, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode One, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
m.09dy5x3, award.award_nomination.nominated_for, Left 4 Dead 2
Postal 2, base.wikipedia_infobox.video_game.platforms, Linux
Shift 2: Unleashed, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead to Rights, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.09dy60n
Outpost 2: Divided Destiny, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Evil Dead: Hail to the King, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Streets of Rage 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
The Walking Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
The Walking Dead: Survival Instinct, base.wikipedia_infobox.video_game.platforms, Xbox 360
Resident Evil 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode One, cvg.game_version.publisher, Valve Corporation
Blood Omen 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike Online 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
MechCommander 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
m.09dy60n, award.award_nomination.nominated_for, Left 4 Dead 2
Deadpool, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_videogame.cvg_genre, Survival horror
Shellshock 2: Blood Trails, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Stronghold 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Space 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Multiplayer video game, cvg.gameplay_mode.games_with_this_mode, Left 4 Dead 2
The Walking Dead, base.wikipedia_infobox.video_game.platforms, Mac OS
Source Engine, cvg.computer_game_engine.used_for_computer_games, Left 4 Dead 2
Sanctum 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Resident Evil: Revelations 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Savage 2: A Tortured Soul, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead or Alive 5 Last Round, base.wikipedia_infobox.video_game.platforms, Xbox 360
Action game, cvg.cvg_genre.games, Left 4 Dead 2
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.platforms, Mac OS
m.0z80gpn, award.award_nomination.nominated_for, Left 4 Dead 2
Half-Life 2: Episode One, base.wikipedia_infobox.video_game.platforms, Linux
F.E.A.R. 2: Reborn, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Tom Clancy's Ghost Recon Advanced Warfighter 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Island, base.wikipedia_infobox.video_game.platforms, Mac OS
7 Days to Die, base.wikipedia_infobox.video_game.platforms, Mac OS
Dracula 2: The Last Sanctuary, base.wikipedia_infobox.video_game.platforms, Mac OS
Company of Heroes 2, base.wikipedia_infobox.video_game.platforms, Linux
m.0z7_pv5, award.award_nomination.nominated_for, Left 4 Dead 2
Left 4 Dead, base.wikipedia_infobox.video_game.platforms, Mac OS
Portal 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, award.ranked_item.appears_in_ranked_lists, m.09klvk9
Shooter game, cvg.cvg_genre.games, Left 4 Dead 2
Deadfall Adventures, base.wikipedia_infobox.video_game.platforms, Xbox 360
Death By Cube, base.wikipedia_infobox.video_game.platforms, Xbox 360
Evil Dead: Regeneration, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Wasteland 2, base.wikipedia_infobox.video_game.platforms, Linux
Killing Floor 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
DeathDrome, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Lost Coast, base.wikipedia_infobox.video_game.developer, Valve Corporation
Die Hard Trilogy, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Audiosurf 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Starglider 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, cvg.computer_videogame.subjects, Zombie apocalypse
Half-Life 2: Deathmatch, cvg.game_version.developer, Valve Corporation
Fallout 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Deadlock II: Shrine Wars, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead, base.wikipedia_infobox.video_game.developer, Turtle Rock Studios
Hidden & Dangerous 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, imdb.topic.title_id, tt1543024
Dead Rising 2: Off the Record, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Killing Floor, base.wikipedia_infobox.video_game.platforms, Linux
Heroes of Might and Magic III: The Shadow of Death, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
The Journeyman Project 2: Buried in Time, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Island, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Rising 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Survival horror, cvg.cvg_genre.games, Left 4 Dead 2
Dead or Alive 5, base.wikipedia_infobox.video_game.platforms, Xbox 360
m.0z7_jlz, award.award_nomination.nominated_for, Left 4 Dead 2
Heroes of Might and Magic III: The Shadow of Death, base.wikipedia_infobox.video_game.platforms, Mac OS
Special Permit: The Expansion Pack for Cabela's Big Game Hunter, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
The Walking Dead: Season Two, base.wikipedia_infobox.video_game.platforms, Mac OS
Life & Death, base.wikipedia_infobox.video_game.platforms, Mac OS
Crackdown 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead Block, base.wikipedia_infobox.video_game.platforms, Xbox 360
Night of the Raving Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
F.E.A.R. 2: Project Origin, base.wikipedia_infobox.video_game.platforms, Xbox 360
The House of the Dead III, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
The Witcher 2: Assassins of Kings, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dracula 2: The Last Sanctuary, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Marlow Briggs and the Mask of Death, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.0z7_jlz
Half-Life 2: Capture the Flag, base.wikipedia_infobox.video_game.platforms, Linux
Exit 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Half-Life 2: Episode Three, cvg.game_version.publisher, Valve Corporation
Left 4 Dead 2, cvg.game_version.publisher, Valve Corporation
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.0z80gpn
Dungeons 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Doom 3: Resurrection of Evil, base.wikipedia_infobox.video_game.platforms, Linux
4x4 EVO 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Gears of War 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Tony Hawk's Underground 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, award.award_winning_work.awards_won, m.0bc37th
Neighbours from Hell 2: On Vacation, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Space 3, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, base.wikipedia_infobox.video_game.developer, Valve Corporation
Portal 2, base.wikipedia_infobox.video_game.platforms, Linux
Hell Yeah! Wrath of the Dead Rabbit, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, user.avh.default_domain.ellerdale_topic.ellerdale_id, 00e2-7f2f
Desperados 2: Cooper's Revenge, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode One, base.wikipedia_infobox.video_game.developer, Valve Corporation
Dead Island, base.wikipedia_infobox.video_game.platforms, Linux
Portal 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_videogame.gameplay_modes, Single-player video game
Manhunt 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2, cvg.game_version.developer, Valve Corporation
BioShock 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
de Blob 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
The Bigs 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.developer, Valve Corporation
Left 4 Dead 2, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Killer Is Dead, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dungeon Keeper 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Rising, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_videogame.release_date, 2009-11-17
Prey 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
The Witcher 2: Assassins of Kings, base.wikipedia_infobox.video_game.platforms, Linux
Dead Space 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Rock of the Dead, base.wikipedia_infobox.video_game.platforms, Xbox 360
m.09klvk9, award.ranking.item, Left 4 Dead 2
Dead or Alive 5 Ultimate, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead, base.wikipedia_infobox.video_game.developer, Valve Corporation
Killing Floor 2, base.wikipedia_infobox.video_game.platforms, Linux
Half-Life 2: Survivor, cvg.game_version.developer, Valve Corporation
Half-Life 2: Capture the Flag, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Assassin's Creed II, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead Effect, base.wikipedia_infobox.video_game.platforms, Mac OS
m.09dy5sv, award.award_nomination.nominated_for, Left 4 Dead 2
The Graveyard, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
BioShock 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Half-Life 2: Episode Two, base.wikipedia_infobox.video_game.developer, Valve Corporation
The House of the Dead: Overkill, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Shift 2: Unleashed, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
DeathSpank, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, award.award_nominated_work.award_nominations, m.09dy5x3
Dead or Alive 4, base.wikipedia_infobox.video_game.platforms, Xbox 360
Deadliest Catch: Alaskan Storm, base.wikipedia_infobox.video_game.platforms, Xbox 360
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Linux
Portal 2, base.wikipedia_infobox.video_game.developer, Valve Corporation
BaboViolent 2, base.wikipedia_infobox.video_game.platforms, Linux
World of the Living Dead, base.wikipedia_infobox.video_game.platforms, Linux
The Witcher 2: Assassins of Kings, base.wikipedia_infobox.video_game.platforms, Mac OS
Elegy for a Dead World, base.wikipedia_infobox.video_game.platforms, Mac OS
Judge Dredd: Dredd vs. Death, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead to Rights II, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
DeathKeep, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dark Souls-Prepare to Die Edition, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, base.wikipedia_infobox.video_game.platforms, Linux
FreeSpace 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
The House of the Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, cvg.computer_videogame.prequel, Left 4 Dead
Portal 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode Two, base.wikipedia_infobox.video_game.platforms, Mac OS
Destruction Derby 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Knightshift 2: Curse of Souls, base.wikipedia_infobox.video_game.platforms, Xbox 360
Law & Order: Dead on the Money, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Mob of the Dead, base.wikipedia_infobox.video_game.platforms, Xbox 360
Condemned 2: Bloodshot, base.wikipedia_infobox.video_game.platforms, Xbox 360
The Journeyman Project 2: Buried in Time, base.wikipedia_infobox.video_game.platforms, Mac OS
Harry Potter and the Deathly Hallows – Part 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dungeons 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
rFactor 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Hitman 2: Silent Assassin, base.wikipedia_infobox.video_game.platforms, Xbox 360
Battlefield 2: Modern Combat, base.wikipedia_infobox.video_game.platforms, Xbox 360
7 Days to Die, base.wikipedia_infobox.video_game.platforms, Linux
m.0qtmdt8, dataworld.gardening_hint.last_referenced_by, Left 4 Dead 2
Postal 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Red Dead Redemption: Undead Nightmare, base.wikipedia_infobox.video_game.platforms, Xbox 360
Deathsmiles II, base.wikipedia_infobox.video_game.platforms, Xbox 360
Perimeter 2: New Earth, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Alone in the Dark 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Death Rally, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Black & White 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Call of Duty 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
The Walking Dead: Season Two, base.wikipedia_infobox.video_game.platforms, Xbox 360
Mechanized Assault & Exploration 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Single-player video game, cvg.gameplay_mode.games_with_this_mode, Left 4 Dead 2
m.09dy5t8, award.award_honor.honored_for, Left 4 Dead 2
Half-Life 2: Episode Two, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Freddi Fish 2: The Case of the Haunted Schoolhouse, base.wikipedia_infobox.video_game.platforms, Mac OS
Call of Duty 2, base.wikipedia_infobox.video_game.platforms, Mac OS
BaboViolent 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Space 3, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
m.09dy68k, award.award_nomination.nominated_for, Left 4 Dead 2
Portal 2, cvg.game_version.developer, Valve Corporation
Just Cause 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead or Alive Online, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Freddi Fish 2: The Case of the Haunted Schoolhouse, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
m.0z7_ld8, award.award_nomination.nominated_for, Left 4 Dead 2
Zombie Apocalypse: Never Die Alone, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
m.0bc37th, award.award_honor.honored_for, Left 4 Dead 2
Age of Pirates 2: City of Abandoned Ships, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Lost Coast, base.wikipedia_infobox.video_game.platforms, Mac OS
Murdered: Soul Suspect, base.wikipedia_infobox.video_game.platforms, Xbox 360
Company of Heroes 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Neverwinter Nights 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dead Space, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Tom Clancy's Ghost Recon Advanced Warfighter 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead or Alive 5 Last Round, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Fatal Fury 3: Road to the Final Victory, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Episode One, cvg.game_version.developer, Valve Corporation
F.E.A.R. 2: Project Origin, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
m.09dy5pz, award.award_nomination.nominated_for, Left 4 Dead 2
Corpse Killer, base.wikipedia_infobox.video_game.platforms, Mac OS
Citadel of the Dead, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, cvg.computer_videogame.developer, Valve Corporation
Call of Duty 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.platforms, Linux
Left 4 Dead, cvg.game_version.developer, Valve Corporation
7 Days to Die, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Mass Effect 2: Overlord, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead, cvg.game_series.games_in_series, Left 4 Dead 2
Cooperative gameplay, cvg.gameplay_mode.games_with_this_mode, Left 4 Dead 2
Mass Effect 2: Lair of the Shadow Broker, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Shadowgun: Deadzone, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, cvg.computer_videogame.cvg_genre, Action game
Killing Floor, base.wikipedia_infobox.video_game.platforms, Mac OS
Half-Life 2: Episode Two, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_videogame.publisher, Valve Corporation
The Witcher 2: Assassins of Kings, base.wikipedia_infobox.video_game.platforms, Xbox 360
Sniper: Ghost Warrior 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_videogame.cvg_genre, Shooter game
Left 4 Dead 2, cvg.computer_videogame.expansions, Left 4 Dead 2: The Passing
Broken Sword: The Angel of Death, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, base.schemastaging.context_name.pronunciation, g.125_m9n55
Dead Island 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Deadpool, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Red Dead Redemption, base.wikipedia_infobox.video_game.platforms, Xbox 360
Deadlight, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Assault Heroes 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead to Rights: Retribution, base.wikipedia_infobox.video_game.platforms, Xbox 360
The House of the Dead 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Soul Reaver 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, cvg.computer_videogame.game_series, Left 4 Dead
Left 4 Dead 2, cvg.computer_videogame.gameplay_modes, Cooperative gameplay
Creatures 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Lost Coast, cvg.game_version.developer, Valve Corporation
Deadly Rooms of Death, base.wikipedia_infobox.video_game.platforms, Linux
Left 4 Dead, cvg.computer_videogame.sequel, Left 4 Dead 2
Kane & Lynch: Dead Men, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2, cvg.game_version.publisher, Valve Corporation
F.E.A.R. 2: Reborn, base.wikipedia_infobox.video_game.platforms, Xbox 360
Dead Island: Riptide, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_videogame.cvg_genre, First-person Shooter
Elegy for a Dead World, base.wikipedia_infobox.video_game.platforms, Linux
Pac-Man and the Ghostly Adventures 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Shellshock 2: Blood Trails, base.wikipedia_infobox.video_game.platforms, Xbox 360
Fallout 2, base.wikipedia_infobox.video_game.platforms, Mac OS
The Guild 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Deathtrap Dungeon, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, cvg.game_version.developer, Valve Corporation
Dead or Alive: Code Chronos, base.wikipedia_infobox.video_game.platforms, Xbox 360
Kane & Lynch: Dead Men, base.wikipedia_infobox.video_game.platforms, Xbox 360
Deadliest Warrior: The Game, base.wikipedia_infobox.video_game.platforms, Xbox 360
Vietcong 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Lost Planet 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
The Walking Dead: Season Two, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Bejeweled 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Prototype 2, base.wikipedia_infobox.video_game.platforms, Xbox 360
Deathmatch Classic, base.wikipedia_infobox.video_game.platforms, Linux
Assassin's Creed II, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Deathmatch, cvg.game_version.publisher, Valve Corporation
World of the Living Dead, base.wikipedia_infobox.video_game.platforms, Mac OS
Deathsmiles, base.wikipedia_infobox.video_game.platforms, Xbox 360
Left 4 Dead 2, cvg.computer_game_expansion.expansion_for, Left 4 Dead 2: The Passing
Brain Dead 13, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead 2, award.award_winning_work.awards_won, m.09dy5t8
Call of Duty: Modern Warfare 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, cvg.computer_videogame.uses_game_engine, Source Engine
The Typing of the Dead, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Deadly Rooms of Death, base.wikipedia_infobox.video_game.platforms, Mac OS
Left 4 Dead 2, cvg.game_version.game, Left 4 Dead 2
Half-Life 2: Episode One, base.wikipedia_infobox.video_game.platforms, Xbox 360
Neverwinter Nights 2: Mask of the Betrayer, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Left 4 Dead, base.wikipedia_infobox.video_game.platforms, Xbox 360
Escape Dead Island, base.wikipedia_infobox.video_game.platforms, Xbox 360
Doom 3: Resurrection of Evil, base.wikipedia_infobox.video_game.platforms, Microsoft Windows

Answer: Left 4 Dead 2: The Passing