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WEB_BUILD.md

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+# Building Flappy Bird for Web
+
+## Prerequisites
+
+1. Install the WebAssembly target:
+```bash
+rustup target add wasm32-unknown-unknown
+```
+
+2. Install wasm-bindgen-cli (will be done automatically by build script):
+```bash
+cargo install wasm-bindgen-cli
+```
+
+## Building
+
+Run the build script:
+```bash
+./build-web.sh
+```
+
+This will:
+- Build the WASM binary
+- Generate JavaScript bindings
+- Copy assets to the `web/` directory
+- Copy the HTML file
+
+## Running Locally
+
+Serve the web directory with any HTTP server:
+
+**Python:**
+```bash
+python3 -m http.server --directory web 8080
+```
+
+**Alternative (if you have basic-http-server):**
+```bash
+cargo install basic-http-server
+basic-http-server web
+```
+
+Then open http://localhost:8080 in your browser!
+
+## Notes
+
+- The game uses WebGL2 for rendering
+- All assets are included in the build
+- Image sampling is set to nearest neighbor for crisp pixel art