Service Workies
Write service worker code to guide Kolohe through a fantasy story
Service Workies is a story game about service workers, the scripts that let a web app work offline. You follow Kolohe, a young service worker, through levels full of monsters. To move on, you write real service worker code, and each stage ends with a challenge that asks you to recall what you learned earlier.
Free · Browser · Intermediate
About Service Workies
The game covers offline support, caching, the service worker lifecycle, background sync and performance. It suits web developers who know JavaScript and want to build Progressive Web Apps.
It runs in the browser, and the site lists it as free. It is a project by Dave Geddes (geddski), made together with Google Developers.
On Breakpoint since 23 Oct 2026.