The term gratis in English comes from the Latin word "gratis" meaning "for thanks".[1]. In several languages, including Italian, French, Romanian, Swedish, Spanish, Dutch, Danish, Norwegian, German, Polish, Bahasa Indonesia and Afrikaans it is the equivalent to "for free". -Wikipedia
Some parts are better than others, and the parts about fun tend to be more lengthy/wordy than need but a number of parts are very useful, such as the parts about paper prototyping and playtesting imo.