|As the mouse was gaining popularity, Sierra began to include optional mouse support in their adventure games. Sierra began porting adventure games created with their AGI (Adventure Game Interpreter) engine to the Amiga in 1986. The Amiga version of this engine allowed for optional mouse control of the player character. This functionality has been extended by some fan created AGI interpreters, such as NAGI and ScummVM. The fan interpreters allow mouse control of characters in most AGI games, as in Sierra's Amiga AGI interpreter, even those that did not originally include that function. When Sierra switched to the more capable SCI (Sierra's Creative Interpreter) engine in 1988, the optional ability to control the playable character with a mouse was present on all platforms. The text parser was originally hidden from view until the player began typing, but as time went on, the SCI engine was improved, the text parser was removed, and games were controlled completely by mouse. All of the 2D adventures by Sierra from the time SCI was introduced used a variant of that engine.|
Mouse controlled adventure games would become the standard after the release of these games, and continue to be the standard to this day. The adventure games that followed these evolved the presentation, but the method of input has largely stayed the same. Even today's direct controlled adventure games often have optional mouse controls as well, or a combination of mouse and keyboard controls.
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