Playing in the browser

The player runs opennfspu.wasm in your browser with gasm's web runtime, in a Web Worker. You need:

• the installed game folder, version 3.5, or an .iso image of it (see Game data);
• a recent Chrome, Edge or Firefox, or Safari 17 and later: WebAssembly, Web Workers, WebGL 2 and OffscreenCanvas (the game draws with WebGL 2 inside the worker);
• about 520 MB of browser storage to import the data once, or none to play without importing.

Choosing the game

Choose your game folder and pick the installed game (or the folder above it), or Choose a disc image and pick an .iso (or raw .bin) of it. The page checks a folder for GameData, FEData and a Porsche.exe of version 3.5, and an image for an ISO 9660 volume (the game itself checks what is inside). Then:

• Import and play copies the files the game reads into the site's private browser storage (OPFS). Later visits start at once with Play. Remove imported data deletes the copy.
• Play without importing reads the files from the folder or image you picked. You pick it again next time.

Nothing is uploaded: the files are read in your browser. Saves (profiles, options) are kept in the browser's storage for this site (IndexedDB).

While playing

The game draws at the size it is shown: use Fullscreen (or double-click) for the full resolution. Holding Esc for a second stops the game; in fullscreen the browser takes Esc to leave fullscreen first. The line under the game shows the frames per second.

For developers

?hashframes=N runs N frames on virtual time and prints the same hash line as gasm-run --headless N (with input= for scripted input, gasm-run's --input syntax, and size=WxH for the drawing size; 1280x720 by default, the size gasm-run --headless draws at, so the hashes match). Other query parameters are passed to the game. tools/web-play-test.mjs drives this page in headless Chrome.