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 video game mod for source? 
Knowledge Triplets: Jailbreak: Source, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Twilight War: After the Fall, cvg.computer_videogame.uses_game_engine, Source Engine
No More Room in Hell, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Postal III
Scivelation, base.wikipedia_infobox.video_game.platforms, Xbox One
Alien Swarm, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Portal, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Linux
Counter-Strike Online, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Dino D-Day, cvg.computer_videogame.uses_game_engine, Source Engine
Dystopia, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Source Engine, cvg.computer_game_engine.used_for_computer_games, Zombie Panic! Source
Half-Life: Source, base.wikipedia_infobox.video_game.platforms, Mac OS
Blade Symphony, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Aperture Tag, base.wikipedia_infobox.video_game.developer, Aperture Tag Team
Tactical Intervention, base.wikipedia_infobox.video_game.developer, FIX Korea
Postal III, base.wikipedia_infobox.video_game.developer, Akella
Source Engine, cvg.computer_game_engine.used_for_computer_games, Blade Symphony
Counter-Strike Online, cvg.computer_videogame.uses_game_engine, GoldSrc
Source Engine, cvg.computer_game_engine.used_for_computer_games, TractorSource
Half-Life: Decay, cvg.computer_videogame.developer, Gearbox Software
Counter-Strike: Source, cvg.computer_videogame.developer, Turtle Rock Studios
Source Engine, cvg.computer_game_engine.used_for_computer_games, They Hunger: Lost Souls
Vampire: The Masquerade – Bloodlines, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Zombie Panic! Source, cvg.computer_videogame.uses_game_engine, Source Engine
SiN Episodes, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Capture the Flag
Source Engine, cvg.computer_game_engine.used_for_computer_games, Kuma\War
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Dystopia, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike: Global Offensive, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Counter-Strike: Source
Source Engine, cvg.computer_game_engine.used_for_computer_games, Deep 6
Source Engine, cvg.computer_game_engine.developer, Valve Corporation
Pirates, Vikings and Knights II, cvg.computer_videogame.uses_game_engine, Source Engine
Kuma\War, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Postal III, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike Online, base.wikipedia_infobox.video_game.developer, Valve Corporation
Source Engine, cvg.computer_game_engine.used_for_computer_games, Dino D-Day
Source Engine, cvg.computer_videogame.mods, Garry's Mod
Dota 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
E.Y.E.: Divine Cybermancy, cvg.computer_videogame.developer, Streum on studio
Black Mesa, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Garry's Mod, cvg.computer_videogame.versions, Garry's Mod
Portal, base.wikipedia_infobox.video_game.platforms, Mac OS
SourceForts, base.wikipedia_infobox.video_game.platforms, Linux
Dystopia, cvg.computer_videogame.uses_game_engine, Source Engine
Tactical Intervention, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Portal 2, base.wikipedia_infobox.video_game.developer, Valve Corporation
Half-Life: Source, base.wikipedia_infobox.video_game.developer, Valve Corporation
The Kill Point Game, cvg.computer_videogame.developer, Kuma Reality Games
Counter-Strike: Source, cvg.computer_videogame.developer, Valve Corporation
Scivelation, cvg.computer_videogame.uses_game_engine, Source Engine
DEFCON, cvg.computer_videogame.publisher, Valve Corporation
Day of Defeat: Source, cvg.computer_videogame.uses_game_engine, Source Engine
Dota 2, base.wikipedia_infobox.video_game.developer, Valve Corporation
Hybrid, cvg.computer_videogame.publisher, Microsoft Studios
Tactical Intervention, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Portal 2, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Scivelation, base.wikipedia_infobox.video_game.developer, Black Wing Foundation
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Survivor
Portal, cvg.computer_videogame.publisher, Microsoft Studios
Team Fortress 2, cvg.computer_videogame.uses_game_engine, Source Engine
g.11r_php4m, cvg.computer_videogame.publisher, Valve Corporation
Portal Project-Beta, cvg.computer_game_mod.game_modded, Portal
Portal, cvg.computer_videogame.mods, Portal Prelude
Half-Life: Decay, base.wikipedia_infobox.video_game.developer, Gearbox Software
Zeno Clash, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Resistance and Liberation
Deathmatch Classic, base.wikipedia_infobox.video_game.developer, Valve Corporation
Counter-Strike, cvg.computer_videogame.publisher, Valve Corporation
Half-Life 2: Lost Coast, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, g.121_4qvh
SourceForts, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Lost Coast
The Crossing, cvg.computer_videogame.developer, Arkane Studios
The Crossing, base.wikipedia_infobox.video_game.developer, Arkane Studios
Natural Selection 2, base.wikipedia_infobox.video_game.developer, Unknown Worlds Entertainment
Half-Life: Source, base.wikipedia_infobox.video_game.platforms, Linux
Korsakovia, base.wikipedia_infobox.video_game.developer, The Chinese Room
Deathmatch Classic, cvg.computer_videogame.developer, Valve Corporation
GoldenEye: Source, base.wikipedia_infobox.video_game.platforms, Mac OS
Garry's Mod, cvg.computer_videogame.publisher, Valve Corporation
Dogfights: The Game, cvg.computer_videogame.uses_game_engine, Source Engine
Garry's Mod, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Empires, cvg.computer_videogame.uses_game_engine, Source Engine
Dark Messiah of Might and Magic, cvg.computer_videogame.uses_game_engine, Source Engine
Ricochet, base.wikipedia_infobox.video_game.developer, Valve Corporation
Source Engine, cvg.computer_game_engine.used_for_computer_games, Tactical Intervention
The Crossing, cvg.computer_videogame.publisher, Valve Corporation
Tactical Intervention, cvg.computer_videogame.publisher, OGPlanet
The Orange Box, base.wikipedia_infobox.video_game.developer, Electronic Arts
GoldenEye: Source, cvg.computer_videogame.versions, GoldenEye: Source
E.Y.E.: Divine Cybermancy, base.wikipedia_infobox.video_game.developer, Streum on studio
Counter-Strike: Source, base.wikipedia_infobox.video_game.platforms, Linux
Zombie Panic! Source, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
TractorSource, cvg.computer_videogame.gameplay_modes, Single-player video game
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Deathmatch
Postal III, cvg.computer_videogame.gameplay_modes, Single-player video game
The Stanley Parable, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Team Fortress 2, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Fistful of Frags
Source Engine, cvg.computer_game_engine.used_for_computer_games, The Orange Box
Natural Selection 2, cvg.computer_videogame.uses_game_engine, Source Engine
Tactical Intervention, cvg.computer_videogame.uses_game_engine, Source Engine
Portal 2, cvg.computer_videogame.uses_game_engine, Source Engine
GoldenEye: Source, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Dogfights: The Game
Half-Life 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Dota 2, base.wikipedia_infobox.video_game.platforms, Linux
GoldenEye: Source, cvg.computer_videogame.game_series, James Bond video games
Bloody Good Time, base.wikipedia_infobox.video_game.developer, Outerlight
Dota 2, cvg.computer_videogame.developer, Valve Corporation
NeoTokyo, base.wikipedia_infobox.video_game.developer, Studio Radi-8
Dystopia, base.wikipedia_infobox.video_game.developer, Puny Human Games
Eternal Silence, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
E.Y.E.: Divine Cybermancy, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Vindictus, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, The DinoHunters
Hybrid, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life: Source, cvg.computer_videogame.versions, Half-Life: Source
Half-Life 2, cvg.computer_videogame.mods, NeoTokyo
Counter-Strike: Condition Zero, base.wikipedia_infobox.video_game.developer, Valve Corporation
Day of Defeat: Source, cvg.computer_videogame.subjects, World War II
Source Engine, cvg.computer_game_engine.used_for_computer_games, Shootout! The Game
Counter-Strike: Global Offensive, base.wikipedia_infobox.video_game.developer, Valve Corporation
Portal, cvg.computer_videogame.gameplay_modes, Single-player video game
Korsakovia, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Insurgency: Modern Infantry Combat
Fistful of Frags, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Nuclear Dawn
TractorSource, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2, base.wikipedia_infobox.video_game.developer, Valve Corporation
Scivelation, cvg.computer_videogame.publisher, TopWare Interactive
g.121_4qvh, cvg.computer_videogame.uses_game_engine, Source Engine
Hybrid, base.wikipedia_infobox.video_game.developer, 5th Cell
Contagion, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike, base.wikipedia_infobox.video_game.developer, Valve Corporation
Bloody Good Time, cvg.computer_videogame.uses_game_engine, Source Engine
Hybrid, cvg.computer_videogame.developer, 5th Cell
Half-Life 2, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Mabinogi
Resistance and Liberation, cvg.computer_videogame.uses_game_engine, Source Engine
Garry's Mod, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Counter-Strike: Global Offensive, base.wikipedia_infobox.video_game.platforms, Mac OS
Counter-Strike: Source, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
GoldenEye: Source, base.wikipedia_infobox.video_game.developer, Team Goldeneye: Source
The Crossing, cvg.computer_videogame.versions, The Crossing
Half-Life 2: Riot Act, cvg.computer_game_mod.game_modded, Half-Life 2
Half-Life: Source, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2, cvg.computer_videogame.uses_game_engine, Havok
Jailbreak: Source, cvg.computer_videogame.versions, Jailbreak Source
Source Engine, cvg.computer_game_engine.used_for_computer_games, Fortress Forever
Counter-Strike: Global Offensive, cvg.computer_videogame.uses_game_engine, Source Engine
Counter-Strike Neo, cvg.computer_videogame.developer, Valve Corporation
Mabinogi, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Iron Grip: The Oppression
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Episode Two
Half-Life: Source, cvg.computer_videogame.publisher, Valve Corporation
Iron Grip: The Oppression, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_mod.game_modded, Garry's Mod
The Stanley Parable, cvg.computer_videogame.uses_game_engine, Source Engine
Postal III, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Korsakovia
Jailbreak: Source, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life: Decay, cvg.computer_videogame.uses_game_engine, Source Engine
Counter-Strike: Source, cvg.computer_videogame.game_series, Counter-Strike
Scivelation, cvg.computer_videogame.versions, Salvation
Half-Life 2, cvg.computer_videogame.mods, Half-Life 2: Riot Act
Postal III, cvg.computer_videogame.developer, TM Studios
Dogfights: The Game, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Contagion, cvg.computer_videogame.gameplay_modes, Multiplayer video game
The DinoHunters, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, NeoTokyo
Dear Esther, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Portal Prelude, cvg.computer_game_mod.game_modded, Portal
Half-Life: Decay, cvg.computer_videogame.uses_game_engine, GoldSrc
Aperture Tag, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Vindictus
Counter-Strike: Global Offensive, cvg.computer_videogame.developer, Valve Corporation
The Ship, cvg.computer_videogame.uses_game_engine, Source Engine
Garry's Mod, cvg.computer_videogame.designers, Garry Newman
g.1q5gl8z92, cvg.computer_videogame.developer, Valve Corporation
Scivelation, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Garry's Mod, cvg.computer_game_mod.game_modded, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Contagion
Source Engine, cvg.computer_game_engine.used_for_computer_games, Day of Defeat: Source
Mabinogi, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Resistance and Liberation, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Natural Selection 2, base.wikipedia_infobox.video_game.platforms, Linux
The Crossing, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Source Engine, cvg.computer_game_engine.used_for_computer_games, Empires
NeoTokyo, cvg.computer_game_mod.game_modded, Half-Life 2
Alien Swarm: Infested, cvg.computer_videogame.uses_game_engine, Source Engine
Portal, cvg.computer_videogame.mods, Portal Project-Beta
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2
Aperture Tag, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Dystopia
Vampire: The Masquerade – Bloodlines, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
They Hunger: Lost Souls, cvg.computer_videogame.uses_game_engine, Source Engine
SourceForts, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Portal, base.wikipedia_infobox.video_game.platforms, PlayStation 3
Zeno Clash, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Eternal Silence, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Nuclear Dawn, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2: Episode Two, cvg.computer_videogame.uses_game_engine, Source Engine
Aperture Tag, cvg.computer_videogame.uses_game_engine, Source Engine
Garry's Mod, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Episode One
Source Engine, cvg.computer_game_engine.used_for_computer_games, The Stanley Parable
Postal III, base.wikipedia_infobox.video_game.developer, Running With Scissors
Source Engine, cvg.computer_game_engine.used_for_computer_games, Prime
Day of Defeat: Source, cvg.computer_videogame.developer, Valve Corporation
Portal, cvg.computer_videogame.influenced, Mari0
Portal, base.wikipedia_infobox.video_game.platforms, Linux
Source Engine, cvg.computer_game_engine.used_for_computer_games, Bloody Good Time
Fistful of Frags, cvg.computer_videogame.uses_game_engine, Source Engine
Day of Defeat: Source, cvg.computer_videogame.versions, Day of Defeat: Source
Jailbreak: Source, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Garry's Mod, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Counter-Strike: Global Offensive
Titanfall, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, The Crossing
Counter-Strike, cvg.computer_videogame.developer, Valve Corporation
The Orange Box, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Zeno Clash
Contagion, cvg.computer_videogame.uses_game_engine, Source Engine
Counter-Strike: Source, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, SiN Episodes
g.1ylhlkqr9, cvg.computer_videogame.uses_game_engine, Source Engine
Dino D-Day, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, SourceForts
Source Engine, cvg.computer_game_engine.used_for_computer_games, Left 4 Dead 2
Dota 2, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Garry's Mod, cvg.computer_videogame.developer, Facepunch Studios
Half-Life: Source, cvg.computer_videogame.gameplay_modes, Single-player video game
Natural Selection 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike: Source, base.wikipedia_infobox.video_game.platforms, Mac OS
SourceForts, cvg.computer_videogame.uses_game_engine, Source Engine
Dota 2, cvg.computer_videogame.uses_game_engine, Source Engine
Day of Defeat: Source, base.wikipedia_infobox.video_game.platforms, Linux
Counter-Strike Online, base.wikipedia_infobox.video_game.developer, Nexon
Portal 2, base.wikipedia_infobox.video_game.platforms, Linux
Alien Swarm, base.wikipedia_infobox.video_game.developer, Valve Corporation
Scivelation, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Titanfall, base.wikipedia_infobox.video_game.developer, Respawn Entertainment
Day of Defeat: Source, base.wikipedia_infobox.video_game.developer, Valve Corporation
Firearms: Source, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Portal 2
Half-Life 2: Capture the Flag, cvg.computer_videogame.uses_game_engine, Source Engine
Counter-Strike Neo, base.wikipedia_infobox.video_game.developer, Valve Corporation
Kuma\War, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2: Capture the Flag, base.wikipedia_infobox.video_game.platforms, Linux
Shootout! The Game, cvg.computer_videogame.uses_game_engine, Source Engine
The Kill Point Game, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Portal, base.wikipedia_infobox.video_game.platforms, Shield Portable
Dino D-Day, base.wikipedia_infobox.video_game.platforms, DirectX
Counter-Strike: Source, cvg.computer_videogame.publisher, Valve Corporation
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life 2: Episode Three
Day of Defeat: Source, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Garry's Mod, base.wikipedia_infobox.video_game.platforms, Mac OS
The Kill Point Game, cvg.computer_videogame.uses_game_engine, Source Engine
Day of Defeat: Source, cvg.computer_videogame.publisher, Valve Corporation
Half-Life: Source, cvg.computer_videogame.uses_game_engine, Source Engine
g.121_4qvh, cvg.computer_videogame.gameplay_modes, Single-player video game
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life: Source
Prime, cvg.computer_videogame.uses_game_engine, Source Engine
Portal, base.wikipedia_infobox.video_game.developer, Valve Corporation
Counter-Strike: Source, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Portal 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Hybrid, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Source Engine, cvg.computer_game_engine.used_for_computer_games, Portal
Pirates, Vikings and Knights II, base.wikipedia_infobox.video_game.platforms, Linux
And Yet It Moves, cvg.computer_videogame.publisher, Valve Corporation
The Crossing, cvg.computer_videogame.gameplay_modes, Single-player video game
Dino D-Day, base.wikipedia_infobox.video_game.platforms, Linux
Portal, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike: Source, base.wikipedia_infobox.video_game.developer, Valve Corporation
NeoTokyo, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, No More Room in Hell
GoldenEye: Source, cvg.computer_videogame.gameplay_modes, Single-player video game
Garry's Mod, base.wikipedia_infobox.video_game.developer, Facepunch Studios
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.developer, Valve Corporation
Dogfights: The Game, base.wikipedia_infobox.video_game.developer, Kuma Reality Games
The Orange Box, base.wikipedia_infobox.video_game.platforms, Linux
The Ship, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Portal 2, cvg.computer_videogame.gameplay_modes, Single-player video game
Eternal Silence, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Natural Selection 2
GoldenEye: Source, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
E.Y.E.: Divine Cybermancy, cvg.computer_videogame.uses_game_engine, Source Engine
Day of Defeat: Source, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Alien Swarm: Infested
No More Room in Hell, cvg.computer_videogame.uses_game_engine, Source Engine
Dear Esther, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Dear Esther
Source Engine, cvg.computer_game_engine.used_for_computer_games, Garry's Mod
Portal 2, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Pirates, Vikings and Knights II
Nuclear Dawn, base.wikipedia_infobox.video_game.platforms, Linux
Half-Life 2: Survivor, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Twilight War: After the Fall
Source Engine, cvg.computer_game_engine.used_for_computer_games, Black Mesa
Source Engine, cvg.computer_game_engine.used_for_computer_games, Vampire: The Masquerade – Bloodlines
The Crossing, cvg.computer_videogame.uses_game_engine, Source Engine
Empires, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike: Global Offensive, base.wikipedia_infobox.video_game.developer, Hidden Path Entertainment
Day of Defeat: Source, base.wikipedia_infobox.video_game.platforms, Mac OS
Scivelation, base.wikipedia_infobox.video_game.platforms, PlayStation 4
Iron Grip: The Oppression, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Scivelation
Source Engine, cvg.computer_game_engine.used_for_computer_games, Dark Messiah of Might and Magic
Portal, base.wikipedia_infobox.video_game.platforms, Shield Tablet
Black Mesa, cvg.computer_videogame.uses_game_engine, Source Engine
Counter-Strike: Source, cvg.computer_videogame.versions, Counter-Strike: Source
Postal III, cvg.computer_videogame.developer, Akella
Source Engine, cvg.computer_game_engine.used_for_computer_games, Eternal Silence
Dear Esther, base.wikipedia_infobox.video_game.developer, The Chinese Room
Postal III, cvg.computer_videogame.developer, Running With Scissors
Left 4 Dead 2, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2: Episode Three, cvg.computer_videogame.uses_game_engine, Source Engine
Garry's Mod, cvg.computer_videogame.gameplay_modes, Single-player video game
Fortress Forever, cvg.computer_videogame.uses_game_engine, Source Engine
Half-Life 2, cvg.computer_videogame.mods, Garry's Mod
Zombie Panic! Source, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Half-Life 2: Capture the Flag, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.platforms, Linux
Half-Life 2: Episode One, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, GoldenEye: Source
Source Engine, cvg.computer_game_engine.used_for_computer_games, E.Y.E.: Divine Cybermancy
GoldenEye: Source, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Counter-Strike Online, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, g.1ylhlkqr9
Dota 2, base.wikipedia_infobox.video_game.platforms, Mac OS
Resistance and Liberation, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Half-Life, base.wikipedia_infobox.video_game.developer, Valve Corporation
Insurgency: Modern Infantry Combat, base.wikipedia_infobox.video_game.developer, Insurgency Team
Source Engine, cvg.computer_game_engine.used_for_computer_games, Aperture Tag
Garry's Mod, cvg.computer_videogame.developer, Team Garry
Source Engine, cvg.computer_game_engine.used_for_computer_games, Dota 2
Blade Symphony, cvg.computer_videogame.uses_game_engine, Source Engine
The Orange Box, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Left 4 Dead
Jailbreak: Source, base.wikipedia_infobox.video_game.developer, Jailbreak Team
Fistful of Frags, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Vindictus, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Hybrid
E.Y.E.: Divine Cybermancy, cvg.computer_videogame.gameplay_modes, Single-player video game
Bloody Good Time, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike Online, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
NeoTokyo, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Firearms: Source
Half-Life: Source, cvg.computer_videogame.game_series, Half-Life
Korsakovia, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Counter-Strike: Source, base.wikipedia_infobox.video_game.developer, Turtle Rock Studios
Half-Life: Source, cvg.computer_videogame.developer, Valve Corporation
Half-Life 2: Deathmatch, cvg.computer_videogame.uses_game_engine, Source Engine
Scivelation, cvg.computer_videogame.gameplay_modes, Single-player video game
Dear Esther, base.wikipedia_infobox.video_game.platforms, Linux
Insurgency: Modern Infantry Combat, cvg.computer_videogame.uses_game_engine, Source Engine
Titanfall, cvg.computer_videogame.uses_game_engine, Source Engine
Valve Corporation, cvg.computer_game_engine_developer.computer_game_engines_developed, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, The Kill Point Game
Alien Swarm, cvg.computer_videogame.uses_game_engine, Source Engine
Source Engine, cvg.computer_game_engine.used_for_computer_games, Half-Life: Decay
Source Engine, cvg.computer_game_engine.used_for_computer_games, Titanfall
Left 4 Dead, cvg.computer_videogame.uses_game_engine, Source Engine
Garry's Mod, cvg.computer_game_mod.game_modded, Half-Life 2
Half-Life 2: Deathmatch, base.wikipedia_infobox.video_game.platforms, Mac OS
Deep 6, cvg.computer_videogame.uses_game_engine, Source Engine
Mari0, cvg.computer_videogame.influenced_by, Portal
Aperture Tag, base.wikipedia_infobox.video_game.platforms, Mac OS
Source Engine, cvg.computer_game_engine.used_for_computer_games, Team Fortress 2
Contagion, cvg.computer_videogame.designers, g.11byb3d8vg
Audiosurf, cvg.computer_videogame.publisher, Valve Corporation
Source Engine, cvg.computer_game_engine.used_for_computer_games, Jailbreak: Source
Source Engine, cvg.computer_game_engine.used_for_computer_games, Counter-Strike Online
Nuclear Dawn, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
E.Y.E.: Divine Cybermancy, cvg.computer_videogame.gameplay_modes, Multiplayer video game
Counter-Strike: Global Offensive, base.wikipedia_infobox.video_game.platforms, Microsoft Windows
Source Engine, cvg.computer_game_engine.used_for_computer_games, Alien Swarm
Aperture Tag, cvg.computer_videogame.gameplay_modes, Single-player video game
Source Engine, cvg.computer_game_engine.used_for_computer_games, The Ship
SourceForts, cvg.computer_videogame.versions, SourceForts
m.0yszgg6, award.award_nomination.nominated_for, Source Engine

Answer: Garry's Mod