AGI
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AGI is the scripting engine used by Sierra for their adventure games in the 1980's. It is only capable of displaying up to 16 colors (although the engine has been updated to use 256 colors by fans), and the graphics consist of simple pixels. A lot of their popular series started out in AGI: King's Quest, Space Quest, and Leisure Suit Larry all had AGI games before their SCI sequels.

Control was accomplished by a combination of the keyboard's arrow keys for player movement, and a text parser for commands.

The Amiga version of AGI included optional basic mouse control of characters rather than arrow keys. Sierra's AGI adventure games bridged the gap between text adventures (now known as interactive fiction) and mouse-driven games like the games using the SCUMM scripting language from LucasArts.

Modern implementations of the engine, such as that found in ScummVM, support the mouse as a means of controlling the character movement like the Amiga versions of the engine, but the text parser is still used.

There are a lot of fan made games that were created using the AGI engine. AGI Tetris is my current favorite. I've since found out that there are actually two versions of AGI Tetris - both are fun, and they're both so different it's worthwhile to play both. The 1998 version has classic points scoring, whereas the 2004 version (the one I was originally referred to) doesn't keep score but has levels that increase in difficulty when you clear a certain amount of lines.

Official AGI Games:
* King's Quest (1984)
* King's Quest II (1985)
* The Black Cauldron (1986)
* Donald Duck's Playground (1986)
* King's Quest III (1986)
* Space Quest (1986)
* Leisure Suit Larry (1987)
* Mixed-Up Mother Goose (1987)
* Police Quest (1987)
* Space Quest II (1987)
* Gold Rush (1988)
* King's Quest IV (1988)
* Manhunter (1988)
* Manhunter 2 (1989)

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