Jay Stelly

1st-person
Aperture Desk Job (2022, Windows)	Valve
Half-Life: Alyx (2020, Windows)	Valve
The Lab (2016, Windows)	Valve is
Counter-Strike: Global Offensive (2012, Windows)	Valve
Portal 2 (2011, Windows)	Personnel
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation
Half-Life 2: Episode Two (2007, Windows)	Valve
Dark Messiah: Might and Magic (2006, Windows)	Special Thanks (Valve Software)
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve
Half-Life: Source (2005, Windows)	Valve is
Counter-Strike: Source (2004, Windows)	Valve
Team Fortress Classic (2003, Windows)	Engine Developer (uncredited)
Half-Life (2001, PlayStation 2)	Valve
Half-Life: Blue Shift (2001, Windows)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects

2D scrolling
Alien Swarm (2010, Windows)	Valve

3rd-person (Other)
NanoTek Warrior (1997, PlayStation)	Additional Design
Hell: A Cyberpunk Thriller (1994, 3DO)	Engineering
Gridders (1994, 3DO)	Special Thanks to

Action
Aperture Desk Job (2022, Windows)	Valve
Half-Life: Alyx (2020, Windows)	Valve
The Lab (2016, Windows)	Valve is
Counter-Strike: Global Offensive (2012, Windows)	Valve
Portal 2 (2011, Windows)	Personnel
Alien Swarm (2010, Windows)	Valve
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation
Half-Life 2: Episode Two (2007, Windows)	Valve
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve
Half-Life: Source (2005, Windows)	Valve is
Counter-Strike: Source (2004, Windows)	Valve
Team Fortress Classic (2003, Windows)	Engine Developer (uncredited)
Half-Life (2001, PlayStation 2)	Valve
Half-Life: Blue Shift (2001, Windows)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects
NanoTek Warrior (1997, PlayStation)	Additional Design

Action RPG
Dark Messiah: Might and Magic (2006, Windows)	Special Thanks (Valve Software)

Add-on
Half-Life: Opposing Force (1999, Windows)	Valve is

Adult
Hell: A Cyberpunk Thriller (1994, 3DO)	Engineering

Adventure
Hell: A Cyberpunk Thriller (1994, 3DO)	Engineering

Cards / tiles
Artifact: Foundry (2021, Windows)	Valve
Artifact (2018, Windows)	Valve

Comedy
Aperture Desk Job (2022, Windows)	Valve
The Lab (2016, Windows)	Valve is
Portal 2 (2011, Windows)	Personnel
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation

Compilation
The Orange Box (2007, PlayStation 3)	Valve
Half-Life: Game of the Year Edition (1999, Windows)	Valve

Contemporary
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team

Cyberpunk / dark sci-fi
Hell: A Cyberpunk Thriller (1994, 3DO)	Engineering

Detective / mystery
Hell: A Cyberpunk Thriller (1994, 3DO)	Engineering

Diagonal-down
Dota: Underlords (2019, Windows)	Valve
Alien Swarm (2010, Windows)	Valve

Direct control
Aperture Desk Job (2022, Windows)	Valve
Half-Life: Alyx (2020, Windows)	Valve
Counter-Strike: Global Offensive (2012, Windows)	Valve
Portal 2 (2011, Windows)	Personnel
Alien Swarm (2010, Windows)	Valve
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation
Half-Life 2: Episode Two (2007, Windows)	Valve
Dark Messiah: Might and Magic (2006, Windows)	Special Thanks (Valve Software)
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve
Half-Life: Source (2005, Windows)	Valve is
Counter-Strike: Source (2004, Windows)	Valve
Team Fortress Classic (2003, Windows)	Engine Developer (uncredited)
Half-Life (2001, PlayStation 2)	Valve
Half-Life: Blue Shift (2001, Windows)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects

Fantasy
Artifact: Foundry (2021, Windows)	Valve
Dota: Underlords (2019, Windows)	Valve
Artifact (2018, Windows)	Valve
The Lab (2016, Windows)	Valve is
Dark Messiah: Might and Magic (2006, Windows)	Special Thanks (Valve Software)

Fixed / flip-screen
Dota: Underlords (2019, Windows)	Valve

Gambling elements
Counter-Strike: Global Offensive (2012, Windows)	Valve

Horror
Half-Life: Alyx (2020, Windows)	Valve
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team

Item
Half-Life: Opposing Force (1999, Windows)	Valve is

Mechanics
Half-Life: Opposing Force (1999, Windows)	Valve is

Mini-games
The Lab (2016, Windows)	Valve is

Motion control
Half-Life: Alyx (2020, Windows)	Valve
The Lab (2016, Windows)	Valve is

NPC / enemy
Half-Life: Opposing Force (1999, Windows)	Valve is

North America
The Lab (2016, Windows)	Valve is
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team
Half-Life: Blue Shift (2001, Windows)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects

Platform
Portal 2 (2011, Windows)	Personnel
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation

Point and select
Artifact: Foundry (2021, Windows)	Valve
Dota: Underlords (2019, Windows)	Valve
Artifact (2018, Windows)	Valve

Post-apocalyptic
Half-Life: Alyx (2020, Windows)	Valve
Half-Life 2: Episode Two (2007, Windows)	Valve
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve

Puzzle
Portal 2 (2011, Windows)	Personnel
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation
Gridders (1994, 3DO)	Special Thanks to

Puzzle elements
Half-Life: Alyx (2020, Windows)	Valve
Half-Life 2: Episode Two (2007, Windows)	Valve
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve

Regional differences
Counter-Strike: Global Offensive (2012, Windows)	Valve
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team
Portal (2007, Windows)	Valve Corporation
Half-Life 2: Episode Two (2007, Windows)	Valve
Dark Messiah: Might and Magic (2006, Windows)	Special Thanks (Valve Software)
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects

Role-playing (RPG)
Dark Messiah: Might and Magic (2006, Windows)	Special Thanks (Valve Software)

Sci-fi / futuristic
Aperture Desk Job (2022, Windows)	Valve
Half-Life: Alyx (2020, Windows)	Valve
The Lab (2016, Windows)	Valve is
Portal 2 (2011, Windows)	Personnel
Alien Swarm (2010, Windows)	Valve
Portal: Still Alive (2008, Xbox 360)	Personnel
Portal (2007, Windows)	Valve Corporation
Half-Life 2: Episode Two (2007, Windows)	Valve
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve
Half-Life: Source (2005, Windows)	Valve is
Half-Life (2001, PlayStation 2)	Valve
Half-Life: Blue Shift (2001, Windows)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects
NanoTek Warrior (1997, PlayStation)	Additional Design

Shooter
Aperture Desk Job (2022, Windows)	Valve
Half-Life: Alyx (2020, Windows)	Valve
Counter-Strike: Global Offensive (2012, Windows)	Valve
Alien Swarm (2010, Windows)	Valve
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team
Half-Life 2: Episode Two (2007, Windows)	Valve
Half-Life 2: Episode One (2006, Windows)	Valve
Half-Life 2 (2005, Xbox)	Valve
Half-Life: Source (2005, Windows)	Valve is
Counter-Strike: Source (2004, Windows)	Valve
Team Fortress Classic (2003, Windows)	Engine Developer (uncredited)
Half-Life (2001, PlayStation 2)	Valve
Half-Life: Blue Shift (2001, Windows)	Valve
Half-Life (1998, Windows)	Special Effects, Environmental Effects
NanoTek Warrior (1997, PlayStation)	Additional Design

Simulation
The Lab (2016, Windows)	Valve is

Story / mission
Half-Life: Opposing Force (1999, Windows)	Valve is

Strategy / tactics
Artifact: Foundry (2021, Windows)	Valve
Dota: Underlords (2019, Windows)	Valve
Artifact (2018, Windows)	Valve

Survival
Alien Swarm (2010, Windows)	Valve
Left 4 Dead 2 (2009, Windows)	Team
Left 4 Dead (2008, Xbox 360)	Development Team

Survival horror
Alien Swarm (2010, Windows)	Valve

Tactical shooter
Counter-Strike: Global Offensive (2012, Windows)	Valve

Top-down
Artifact: Foundry (2021, Windows)	Valve
Artifact (2018, Windows)	Valve
Gridders (1994, 3DO)	Special Thanks to

Trading / collectible card
Artifact: Foundry (2021, Windows)	Valve
Artifact (2018, Windows)	Valve

Turn-based
Artifact: Foundry (2021, Windows)	Valve
Dota: Underlords (2019, Windows)	Valve
Artifact (2018, Windows)	Valve

Turn-based strategy (TBS)
Dota: Underlords (2019, Windows)	Valve