Play browser games offline — no internet connection needed after your first visit. Weekly Arcade is a Progressive Web App (PWA) that caches games locally so you can play on planes, subways, or anywhere without wifi.
Weekly Arcade uses a Service Worker to cache game files locally on your device after the first visit. Once cached, games load instantly without an internet connection. This technology - called a Progressive Web App (PWA) - is supported by Chrome, Safari, Firefox, and Edge on both desktop and mobile. According to web.dev, PWAs combine the reach of the web with the experience of native apps, including offline support, home screen installation, and push notifications.
The site is a Progressive Web App with a service worker, which means the game files are stored by your browser the first time you load a page. On a later visit the browser serves those cached files whether or not it can reach the network, so the game opens the same way with no connection at all. Twenty of the twenty-six games in the catalogue work this way. Nothing needs to be downloaded deliberately, there is no offline mode to enable, and there is no app to install - though you can add the site to your home screen if you want it to open like one.
Gameplay is entirely local, so nothing about playing depends on the network. What does need it is anything that talks to the server: leaderboard submission, achievements syncing to your account, and cross-device saved progress. An offline run plays normally and is simply not recorded. Local progress is kept in the browser regardless, so a run you completed on a plane is still there when you land - and if you are signed in, it syncs once the connection returns. The six games that do not work offline are the ones whose core loop needs a live server, primarily the multiplayer titles.
Twenty of the twenty-six. The six that do not are the ones whose core loop needs a live server - principally the multiplayer games, where an offline match is not a meaningful thing to offer.
No. The site is a Progressive Web App, so a game you have opened once is cached by your browser automatically and will start with no connection afterwards. You can add the site to your home screen if you want an app-like icon, but that is optional and installs nothing.
Play it once while online. That is the whole process - loading the page caches what the game needs. There is no offline mode to enable and no download button to press.
Local progress is kept in your browser, so anything you achieved offline is still there. Leaderboard submission needs a connection, so an offline run is not ranked. If you are signed in, progress syncs to your account once you are back online.
Yes, that is the case they are built for. Once cached, a game starts and plays with the network completely unavailable - in airplane mode, in a tunnel, or on a train with no signal. Only the leaderboard is unavailable.