js13kGames (also referenced as JS13K) is a game jam competition, focused on creating browser games that are no larger than 13 kilobytes when compressed using ZIP.[1][2][3]
Participants are not permitted to use external services or libraries, and all assets must also fit within the size limit.[4]
Games are programmed in JavaScript and HTML5.[5][6][7]
The competition has a different theme each year and participants have the freedom to interpret it however they like.[8]
Winners receive prizes consisting of money, digital rewards, T-shirts, and promotional items.[9]