js13kGames is an annual month-long JavaScript coding competition initiated by @end3r in 2012, which invites developers of all skill levels to create games within a 13 kilobyte JavaScript limit, based on a theme revealed at the start of the contest. This year, the competition includes a WebXR category, encouraging participants to explore virtual reality experiences using A-Frame or Babylon.js, while adhering to the same file size constraint. Participants often utilize micro game engines like Kontra.js and minification tools such as Closure Compiler to overcome the challenge of the size limit. Image and audio optimization are crucial, with tools like Zpng and jsfxr aiding in reducing resource size. Developers can draw inspiration and techniques from past entries and retrospectives, which provide insights into maximizing productivity and creativity within the event’s constraints. The competition serves as an opportunity not only to hone JavaScript and game development skills but also to engage with a community of developers, with resources and updates shared through the js13kGames website and social media channels.