js13kGames is an annual game development competition for HTML5 game developers, challenging participants to create games based on a secret theme within a strict limit of 13 kilobytes after minification and compression. Since its inception in 2012, the competition has showcased impressive creativity and technical skill, with themes such as "Number 13," "Bad Luck," "The Elements," "Reversed," and "Glitch" inspiring a range of engaging and innovative games. Despite the size constraint, developers have managed to produce polished and compelling entries, some of which have even evolved into full-fledged games available on platforms like Steam. Organized by Andrzej Mazur, the event continues to support developers with resources and tools, fostering a vibrant community of game creators who defy the limitations of file size to deliver high-quality gaming experiences.