"Suveh Nux" is a short, puzzle-oriented piece of interactive fiction by David Fisher, with a neat premise: the player is trapped in a vault (that's not the neat part) and can escape only if he learns the magical language that controls his environment. Plenty of interactive fiction games involve puzzles about magic words. "Suveh Nux" takes this a step further with a whole magical grammar to learn, including verbs, nouns, and modifying phrases.
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