# Silent Sand > Silent Sand is a browser-based zen garden simulator for mindfulness and creative focus. It includes a free-form sand-raking sandbox plus challenge modes, with local saves and optional online features. ## Core Experience - [Main App](https://silentsand.me/): Interactive zen garden with drawing controls, symmetry tools, themes, saves, and sharing. - [Main Page FAQ and Usage Notes](https://silentsand.me/index.html): Built-in FAQ and user-facing instructions for controls and mindfulness use. ## Modes and Assets - [To the Core and Infestation Modes](https://silentsand.me/index.html): Mode descriptions and in-app flows for progression/challenge gameplay. ## Legal and Contact - [Privacy Policy](https://silentsand.me/datenschutz.html): Data handling, local storage usage, third-party processors, and GDPR rights. - [Legal Notice (Impressum)](https://silentsand.me/impressum.html): Operator identity, legal disclosures, and direct contact details. ## Technical Reference - [Application Markup](https://silentsand.me/index.html): UI structure and runtime client configuration. - [Application Logic](https://silentsand.me/script.js): Core simulation logic, mode behavior, persistence, and input handling. - [Stylesheet](https://silentsand.me/style.css): UI layout and visual styling. - [Service Worker](https://silentsand.me/sw.js): Caching and offline behavior. - [PWA Manifest](https://silentsand.me/favicon/site.webmanifest): App metadata and icon declarations.