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Adventure Game Interpreter (AGI) gamesGroup DescriptionThe Adventure Game Interpreter (AGI) engine was first introduced by Sierra for its early early adventure games, pioneered by King's Quest (1984). The game engine was designed by Arthur Abraham was previously meant for IBM PCjr but was ported to other platforms. King's Quest IV (1988) was the last commercial game published by Sierra using the AGI engine as the engine could no longer compete with other adventure game engines at that time. The AGI engine however, continues to be used to create "unofficial" (shareware/freeware) AGI games by nostalgic individual programmers and companies. Not to be confused with the Game Group: Adventure Game Studio.
| Game Title | Year | Platform | Publisher |  MobyScore |
| Fuck Quest | 1998 | Atari ST, DOS, Windows | | 1.38 |
| Fuck Quest 2: Romancing the Bone | 2004 | DOS, Windows | | 1.61 |
| King's Quest II: Romancing the Throne | 1985 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, PC Booter | Sierra On-Line, Inc. | 3.03 |
| Manhunter 2: San Francisco | 1989 | Amiga, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.21 |
| Cloak of Darkness | 1999 | Windows | | 3.25 |
| Manhunter: New York | 1988 | Amiga, Apple IIgs, Atari ST, DOS | Sierra On-Line, Inc. | 3.28 |
| Roberta Williams' Mixed-Up Mother Goose | 1987 | Amiga, Apple II, Apple IIgs, Atari ST, DOS | Sierra On-Line, Inc. | 3.33 |
| The Black Cauldron | 1986 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, PC Booter | Sierra On-Line, Inc. | 3.39 |
| Voodoo Girl: Queen of the Darned | 2002 | Atari ST, DOS | | 3.40 |
| Gold Rush! | 1988 | Amiga, Apple II, Apple IIgs, Atari ST, DOS | Sierra On-Line, Inc. | 3.48 |
| Donald Duck's Playground | 1984 | Amiga, Atari ST, Commodore 64, PC Booter, TRS-80 CoCo | Sierra On-Line, Inc. | 3.50 |
| Police Quest: In Pursuit of the Death Angel | 1987 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.56 |
| Space Quest II: Chapter II - Vohaul's Revenge | 1987 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.61 |
| King's Quest | 1984 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, Macintosh, PC Booter, SEGA Master System | IBM | 3.62 |
| Space Quest 0: Replicated | 2003 | Windows | | 3.67 |
| Enclosure | 2004 | Windows | Femo Duo Entertainment | 3.67 |
| Leisure Suit Larry in the Land of the Lounge Lizards | 1987 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, Macintosh, TRS-80 CoCo | Sierra On-Line, Inc. | 3.79 |
| King's Quest IV: The Perils of Rosella | 1988 | Amiga, Apple II, Apple IIgs, Atari ST, DOS | Sierra On-Line, Inc. | 3.81 |
| King's Quest III: To Heir is Human | 1986 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, TRS-80 CoCo | Sierra On-Line, Inc. | 3.83 |
| Space Quest: The Sarien Encounter | 1986 | Amiga, Apple II, Apple IIgs, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.91 | Selected Covers
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