Many interactive fiction engines, despite their text-based nature, utilize sophisticated parser technology capable of understanding complex, grammatically incorrect, or even misspelled player input.
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The original *Doom* (1993) was so influential that its source code was reverse-engineered and ported to an astonishing variety of devices, including calculators and toasters.
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The original Pac-Man was designed with only 256 possible game configurations, meaning that after a certain number of levels, the game would simply repeat itself.
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