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: which video game engine's successor engine is unreal engine? 
Knowledge Triplets: Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tribes Universe
Tribes: Ascend, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Ghost Recon Advanced Warfighter 2
Legendary, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Scivelation
APB: All Points Bulletin, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Magic: The Gathering – Battlegrounds, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Army of Two, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Elveon, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Lost Odyssey
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Advent Rising
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Men of Valor
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Dead Man's Hand
Unreal Engine 3, cvg.computer_game_engine.predecessor_engine, Unreal Engine 2
Ugo Volt, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Splinter Cell: Chaos Theory
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Unreal II: The Awakening
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, BlackSite: Area 51
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Army of Two
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Brothers in Arms: Double Time
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Thor: God of Thunder
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Brothers in Arms: Road to Hill 30
Global Agenda, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine, cvg.computer_game_engine_family.engines_in_this_family, Unreal Engine 1
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tron: Evolution
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Viscera Cleanup Detail
Shadow Complex, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mass Effect 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, The Chronicles of Spellborn
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Ugo Volt
Lineage II, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Crimson Dragon, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Red Orchestra: Ostfront 41-45
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Wheelman
Mirror's Edge, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mortal Kombat vs. DC Universe
Blade & Soul, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Hour of Victory, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Frontlines: Fuel of War
Shrapnel, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Shark Tale
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mass Effect 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Batman: Arkham Asylum
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tribes: Vengeance
SWAT 4, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Leisure Suit Larry: Box Office Bust
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, TNA Impact!
Endless Saga, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Scivelation, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tribes: Ascend
Killing Floor, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Advent Rising, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Killing Floor
Turok, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Epic Games, cvg.computer_game_engine_developer.computer_game_engines_developed, Unreal Engine 3
Damnation, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, BioShock 2
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Land of the Dead: Road to Fiddler's Green
Deus Ex: Invisible War, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Parabellum
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Aliens: Colonial Marines
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Unreal Tournament 2004
Gears of War 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Splinter Cell
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Splinter Cell: Pandora Tomorrow
Unreal Engine 4, cvg.computer_game_engine.predecessor_engine, Unreal Engine 3
Daylight, cvg.computer_videogame.uses_game_engine, Unreal Engine 4
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, This Is Vegas
Unreal Engine 4, cvg.computer_game_engine.used_for_computer_games, Daylight
Spec Ops: The Line, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Frontlines: Fuel of War, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Parabellum, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 4, cvg.computer_game_engine.developer, Epic Games
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Ashura: Dark Reign
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Splinter Cell: Essentials
Men of Valor, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Mass Effect, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Unreal Tournament 2003
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mirror's Edge
HoopWorld, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Ragnarok Online 2: The Gate of the World, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Red Steel
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Elveon
This Is Vegas, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Destroy All Humans! Path of the Furon
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Fury
Singularity, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Alien Swarm, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Alliance of Valiant Arms
Epic Games, cvg.computer_game_engine_developer.computer_game_engines_developed, Unreal Engine 4
Unreal Engine 4, cvg.computer_game_engine.used_for_computer_games, Tekken 7
Land of the Dead: Road to Fiddler's Green, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Robert Ludlum's The Bourne Conspiracy, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Earth No More, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Black College Football: BCFX: The Xperience
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, DC Universe Online
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Medal of Honor: Airborne
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's EndWar
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Lemony Snicket's A Series of Unfortunate Events
Unreal Engine 2, cvg.computer_game_engine.successor_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Rainbow Six 3: Raven Shield
Fury, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Stargate Worlds, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Empire
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, The Agency: Covert Ops
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Darkest Hour: Europe '44-'45
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Postal 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Dark Void
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Too Human
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Undertow
Unreal Tournament 2003, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Alpha Protocol
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, World War II Combat: Iwo Jima
Mare Nostrum, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Red Orchestra 2: Heroes of Stalingrad
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Unreal Tournament III
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mass Effect
Postal 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Undertow, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Highlander: The Game
Dark Void, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Exteel, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Gears of War
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Thief: Deadly Shadows
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Global Agenda
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Surf's Up
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, XIII
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Rainbow Six: Vegas
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Ghost Recon 2
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Harry Potter and the Prisoner of Azkaban
Dust 514, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Empire, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Open Season, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Unreal Championship 2: The Liandri Conflict
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Stranglehold
Saw, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Tekken 7, cvg.computer_videogame.uses_game_engine, Unreal Engine 4
Unreal Engine 3, cvg.computer_game_engine.engine_family, Unreal Engine
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Spec Ops: The Line
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, The Scourge Project
Duke Nukem Forever, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Ender's Game: Battle Room
Section 8, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Stargate Worlds
Warpath, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Magus, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.developer, Epic Games
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Turning Point: Fall of Liberty
Unreal Engine 3, cvg.computer_game_engine.successor_engine, Unreal Engine 4
Huxley, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Red Steel, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Infinity Blade
Unreal Championship, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine, cvg.computer_game_engine_family.engines_in_this_family, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Section 8: Prejudice
Monday Night Combat, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Tournament 2004, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Tron: Evolution, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Fatal Inertia, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Harry Potter and the Chamber of Secrets, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Gears of War, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mare Nostrum
Unreal Engine 4, cvg.computer_game_engine.engine_family, Unreal Engine
BioShock 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Furious 4, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Stargate SG-1: The Alliance, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Heist, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Robert Ludlum's The Bourne Conspiracy
Brothers in Arms: Hell's Highway, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Spider-Man 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Fat Princess, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Tom Clancy's EndWar, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Ghost Recon Advanced Warfighter
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Spider-Man 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, HoopWorld
Rise of the Argonauts, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, 50 Cent: Blood on the Sand
Unreal Engine, cvg.computer_game_engine_family.engines_in_this_family, Unreal Engine 3
Unreal Championship 2: The Liandri Conflict, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Kinect Adventures!
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Batman: Arkham Origins
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Saw
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Borderlands
Unreal II: The Awakening, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Fat Princess
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Pariah
Mass Effect 3, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Brothers in Arms: Earned in Blood
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Vanguard: Saga of Heroes
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Exteel
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Lineage II
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Mortal Online
BioShock, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Open Season
Tribes Universe, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.developer, Epic Games
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Turok
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Singularity
Tom Clancy's Ghost Recon 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Thor: God of Thunder, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, I Am Alive
Warm Gun, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
XIII, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Monster Madness: Grave Danger
Pariah, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Duke Nukem Forever
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, RoboBlitz
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Shrek 2
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Star Wars: Republic Commando
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Crimson Dragon
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Warpath
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Brothers in Arms: D-Day
MagnaCarta 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, America's Army: Rise of a Soldier
Fairytale Fights, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Splinter Cell: Double Agent
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Legendary
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Damnation
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Magic: The Gathering – Battlegrounds
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Blacklight: Tango Down
Infinity Blade II, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Unreal Championship
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Infinity Blade II
Wheelman, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Turning Point: Fall of Liberty, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Too Human, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Magna Carta: Crimson Stigmata
Alpha Protocol, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Epic Games, cvg.computer_game_engine_developer.computer_game_engines_developed, Unreal Engine 1
Unreal Engine 1, cvg.computer_game_engine.engine_family, Unreal Engine
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Rainbow Six: Vegas 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Tom Clancy's Splinter Cell: Conviction
TNA Impact!, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Brothers in Arms: Hell's Highway
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Earth No More
Infinity Blade, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
RoboBlitz, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Shrapnel
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Hour of Victory
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Dust 514
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, The Punisher: No Mercy
DC Universe Online, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Huxley
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Endless Saga
Unreal Tournament III, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Harry Potter and the Prisoner of Azkaban, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Killing Floor
m.04mnx9_, dataworld.gardening_hint.replaced_by, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Fatal Inertia
Hail to the Chimp, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Harry Potter and the Chamber of Secrets
Lost Odyssey, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Transformers: Dark of the Moon
Epic Games, cvg.computer_game_engine_developer.computer_game_engines_developed, Unreal Engine 2
Mobile Forces, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Monster Madness: Battle for Suburbia
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Warm Gun
The Scourge Project, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Shark Tale, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Devastation, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 1, cvg.computer_game_engine.successor_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, CrimeCraft
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, MagnaCarta 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Gears of War 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, X-Men Origins: Wolverine
Mass Effect 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Sherlock Holmes: Crimes & Punishments
Killing Floor, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Heist
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, SWAT 4
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Shadow Ops: Red Mercury
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Shadow Complex
Rogue Warrior, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Warmonger: Operation Downtown Destruction
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Magus
Section 8: Prejudice, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Psi-Ops: The Mindgate Conspiracy
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Rogue Warrior
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Mobile Forces
Unreal Engine 1, cvg.computer_game_engine.developer, Epic Games
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, World War II Combat: Road to Berlin
Tom Clancy's Splinter Cell, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Fairytale Fights
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, APB: All Points Bulletin
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Monday Night Combat
Surf's Up, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Army of Two: The 40th Day
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Devastation
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Section 8
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Hail to the Chimp
Dead Man's Hand, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
I Am Alive, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Borderlands, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, BioShock
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Blade & Soul
The Last Remnant, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Shrek 2, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Hunted: The Demon's Forge
Kinect Adventures!, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Furious 4
CrimeCraft, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Mortal Online, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.engine_family, Unreal Engine
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, The Last Remnant
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, American McGee's Grimm
Lemony Snicket's A Series of Unfortunate Events, cvg.computer_videogame.uses_game_engine, Unreal Engine 2
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Supersonic Acrobatic Rocket-Powered Battle-Cars
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Deus Ex: Invisible War
Monster Madness: Grave Danger, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Stargate SG-1: The Alliance
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Ragnarok Online 2: The Gate of the World
Unreal Engine 2, cvg.computer_game_engine.used_for_computer_games, Alien Swarm
Unreal Engine, cvg.computer_game_engine_family.engines_in_this_family, Unreal Engine 4
Stranglehold, cvg.computer_videogame.uses_game_engine, Unreal Engine 3
Unreal Engine 3, cvg.computer_game_engine.used_for_computer_games, Rise of the Argonauts
Unreal Engine 2, cvg.computer_game_engine.predecessor_engine, Unreal Engine 1

Answer: Unreal Engine 2