I can't play any text-based game unless there is an AI sentence-parser function. That's what makes it fun.
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Oh dude, it's fun as hell. Once you get the sentence parser working, you can like, make AI bots that respond to you and make you pass Turing Tests, etc. Also, interactive fiction (w/ text parsers) allow you to make weird little grammar problems, like "look AT window" vs. "look THROUGH window" or "look OUT window".