Portal (2007), Buka Entertainment
Half-Life 2: Episode One (2006), Valve Corporation
Left 4 Dead 2 (2009), Valve Corporation
Duke Nukem 64 (1997), GT Interactive Software Corp.
Shadow Warrior (1997), GT Interactive Software Corp.
Half-Life (1998), Sierra On-Line, Inc.
Half-Life 2: Episode Two (2007), Buka Entertainment
Duke Nukem 3D (1996), FormGen, Inc.
The Orange Box (2007), Valve Corporation
Left 4 Dead (2008), Valve Corporation
Duke Nukem Advance (2002), Take-Two Interactive Software, Inc.
Duke Nukem 3D (1998), Tec Toy Indústria de Brinquedos S.A.
Half-Life: Opposing Force (1999), Sierra On-Line, Inc.
Half-Life (Game of the Year Edition) (1999), Sierra On-Line, Inc.
Half-Life: Blue Shift (2001), Sierra On-Line, Inc.
Counter-Strike: Source (2004), Valve Corporation
Half-Life (2001), Sierra On-Line, Inc.
Half-Life 2 (2004), Valve Corporation
Duke Nukem 3D (Atomic Edition) (1996), GT Interactive Software Corp.
Dark Messiah of Might and Magic (2006), Ubisoft, Inc.
Duke Nukem 3D: Plutonium Pak (1996), GT Interactive Software Corp.

Duke Nukem 3D (1996), FormGen, Inc.
Half-Life 2: Episode Two (2007), Buka Entertainment
Half-Life (1998), Sierra On-Line, Inc.
Duke Nukem 64 (1997), GT Interactive Software Corp.
Left 4 Dead 2 (2009), Valve Corporation
Shadow Warrior (1997), GT Interactive Software Corp.
Half-Life 2: Episode One (2006), Valve Corporation
Half-Life: Opposing Force (1999), Sierra On-Line, Inc.
Half-Life (Game of the Year Edition) (1999), Sierra On-Line, Inc.
Duke Nukem 3D (1998), Tec Toy Indústria de Brinquedos S.A.
Duke Nukem Advance (2002), Take-Two Interactive Software, Inc.
The Orange Box (2007), Valve Corporation
Left 4 Dead (2008), Valve Corporation
Half-Life 2 (2004), Valve Corporation
Half-Life (2001), Sierra On-Line, Inc.
Counter-Strike: Source (2004), Valve Corporation
Half-Life: Blue Shift (2001), Sierra On-Line, Inc.
Duke Nukem 3D: Plutonium Pak (1996), GT Interactive Software Corp.
Duke Nukem 3D (Atomic Edition) (1996), GT Interactive Software Corp.

Half-Life: Blue Shift (2001), Sierra On-Line, Inc.
Half-Life 2 (2004), Valve Corporation
Half-Life (2001), Sierra On-Line, Inc.
Duke Nukem 3D (Atomic Edition) (1996), GT Interactive Software Corp.
Half-Life 2: Episode One (2006), Valve Corporation
Duke Nukem 64 (1997), GT Interactive Software Corp.
Half-Life (1998), Sierra On-Line, Inc.
Duke Nukem 3D (1996), FormGen, Inc.
Half-Life 2: Episode Two (2007), Buka Entertainment
Half-Life: Opposing Force (1999), Sierra On-Line, Inc.

Half-Life 2 (2004), Valve Corporation
The Orange Box (2007), Valve Corporation
Portal (2007), Buka Entertainment

Half-Life 2: Episode Two (2007), Buka Entertainment
Half-Life 2: Episode One (2006), Valve Corporation

Left 4 Dead (2008), Valve Corporation
Left 4 Dead 2 (2009), Valve Corporation

Dark Messiah of Might and Magic (2006), Ubisoft, Inc.

Dark Messiah of Might and Magic (2006), Ubisoft, Inc.