Weekend crash courses in Python, Assembly and Rust, built around the PA Test Bench.
Checking offline storage…
Open this page once while online, then add it to your home screen: in Chrome on Android, open the ⋮ menu and choose Install app (or Add to Home screen). It then opens like an app and works without a connection, including the in-page Python and the Cortex-M simulator. Your progress is saved on the phone.
Rust is the exception: its code is compiled on the Rust Playground, so Run and Check need a connection. Its lessons, hints and solutions still work offline.