by Sierra On-Line, Inc., 1988
by Sierra On-Line, Inc., 1991
by Sierra On-Line, Inc., 1987
by Yosemite Entertainment, 1998
by Sunstorm Interactive, Inc., 2001
by Bullfrog Productions, Ltd., 1998
by Unknown Identity, 1998
by Ratbag Pty, Ltd., 1998
by Titus Ltd., 1991
by Titus Ltd., 1993
by Brøderbund Software, Inc., 1989
by Brøderbund Software, Inc., 1993
by Red Orb Entertainment, 1999
by Innerloop Studios, 2000
by id Software, Inc., 1996
by id Software, Inc., 1997
by Rogue Entertainment, 1998
by Xatrix Entertainment, Inc., 1998
by id Software, Inc., 1999
by PopTop Software Inc., 1998
by Warthog Games Ltd., 2002
by Cygnus Software Inc., 1994
by DreamForge Intertainment, Inc., 1995
by Gremlin Interactive Limited, 1996
by Dynamix, Inc., 1990
