Settings
Local preferences for this browser. The playground stores nothing on the backend.
Recent activity lives only in this browser tab. Your mastery progression, theme and language preference are saved in this browser (localStorage) and persist across visits. Nothing is ever sent to or stored on the backend.
Mastery progression
Reset the local mastery progression tracked in this browser. This affects only your device.
Language
The playground is available in English, French, German and Spanish. Switch language from the header; your choice loads the matching localized pages.
EnglishTheme
Toggle the active theme from the header. The current value is shown below.
Light