WikiWidgets are interactive JavaScript widgets (little "games" you may say) that can be inserted into Wikipedia articles to aid the understanding of certain topics.
This repo contains the initialisation script. Import the WikiWidgets.js script from your MediaWiki:Common.js to enable WikiWidgets at any MediaWiki wiki, not just Wikipedia.
See the documentation at https://commons.wikimedia.org/wiki/Commons:WikiProject_WikiWidgets for more.