The Sims series of video games features an improvised language called Simlish as the exclusive spoken language, so the characters cannot be made to speak English. Simlish successfully sidesteps the issues of repeated phrases and multiple language dubs that would be required if English, or any other language, was used.

Simlish is an improvised language developed for the original Sims video game released in February 2000. The language is untranslatable and constantly changes because new phrases and words are recorded for each game. The Sims goes so far as to record music in Simlish and feature it in the game. The developers of The Sims have discussed many times the importance of consistent Simlish across their games to convey a certain atmosphere.