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Game Engine: Sierra's Creative Interpreter (SCI)Group DescriptionWhile Sierra's AGI had demonstrated surprising legs, having been initially conceived for the PCjr within a matter of a few years it found itself underequipped to take advantage of a hardware revolution of expanded graphics and sound capabilities. Jeff Stephenson was called upon to provide a game-making framework for the current and future markets, and he provided an object-oriented scripting language, initially entitled the LSCI, for Large-model Script Code Interpreter, soon re-styled Sierra's Creative Interpreter. It was in continuous development, with five major versions, from 1988 (the first SCI release King's Quest 4, also variantly released as Sierra's final AGI game) through to 1996.
| Game Title | Year | Platform | Publisher | MobyScore |
| Police Quest 2: The Vengeance | 1988 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.71 |
| Leisure Suit Larry Goes Looking for Love (In Several Wrong Places) | 1988 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.70 |
| King's Quest IV: The Perils of Rosella | 1988 | Amiga, Apple II, Apple IIgs, Atari ST, DOS | Sierra On-Line, Inc. | 3.81 |
| Leisure Suit Larry III: Passionate Patti in Pursuit of the Pulsating Pectorals | 1989 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.73 |
| The Colonel's Bequest | 1989 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.71 |
| Hero's Quest: So You Want To Be A Hero | 1989 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.84 |
| Space Quest III: The Pirates of Pestulon | 1989 | Amiga, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.97 |
| Codename: ICEMAN | 1989 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.31 |
| Hoyle Official Book of Games: Volume 1 | 1989 | Amiga, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.51 |
| Leisure Suit Larry: Triple Pack | 1990 | Amiga, DOS | Sierra On-Line, Inc. | 3.86 |
| Conquests of Camelot: The Search for the Grail | 1990 | Amiga, Atari ST, DOS | Sierra On-Line, Inc. | 3.65 |
| Roberta Williams' King's Quest I: Quest for the Crown | 1990 | Amiga, DOS | Sierra On-Line, Inc. | 3.50 |
| Quest for Glory II: Trial by Fire | 1990 | Amiga, DOS | Sierra On-Line, Inc. | 3.79 |
| Mixed-Up Mother Goose | 1990 | Amiga, DOS | Sierra On-Line, Inc. | 4.00 |
| Hoyle Official Book of Games: Volume 2 | 1990 | Amiga, Atari ST, DOS, Macintosh | Sierra On-Line, Inc. | 3.62 |
| King's Quest V: Absence Makes the Heart Go Yonder! | 1990 | Amiga, DOS, Macintosh, Windows 3.x | Sierra On-Line, Inc. | 3.87 |
| Castle of Dr. Brain | 1991 | Amiga, DOS, Macintosh | Sierra On-Line, Inc. | 3.98 |
| Jones in the Fast Lane | 1991 | DOS | Sierra On-Line, Inc. | 3.90 |
| Mixed-Up Fairy Tales | 1991 | DOS | Sierra On-Line, Inc. | 4.00 |
| Space Quest IV: Roger Wilco and the Time Rippers | 1991 | Amiga, DOS, Macintosh, Windows 3.x | Sierra On-Line, Inc. | 3.88 |
| Space Quest I: Roger Wilco in the Sarien Encounter | 1991 | Amiga, DOS, Macintosh | Sierra On-Line, Inc. | 3.85 |
| EcoQuest: The Search for Cetus | 1991 | DOS | Sierra On-Line, Inc. | 3.88 |
| Hoyle Official Book of Games: Volume 3 | 1991 | Amiga, DOS | Sierra On-Line, Inc. | 3.64 |
| Police Quest 3: The Kindred | 1991 | Amiga, DOS | Sierra On-Line, Inc. | 3.66 |
| Leisure Suit Larry 1: In the Land of the Lounge Lizards | 1991 | Amiga, DOS, Macintosh | Sierra On-Line, Inc. | 3.79 |
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