The Legend of Zelda
You supply your own Legend of Zelda (NES) ROM. It is read in the browser and never uploaded. A byte-exact rebuild additionally requires the USA Rev 0 (PRG0) dump — headerless PRG sha1 a12d74c73a0481599a5d832361d168f4737bbcf6, crc32 3FE272FB; the Rev 1 (PRG1) dump plays fine but will not byte-match.
Files are read on this device. They are never uploaded.
Keyboard and mouse recommended.
The game downloads only after you press Play. Sound starts off.
Controls
| Arrow keys | move |
| X | A (sword) |
| Z | B (selected item) |
| Enter | Start |
| Shift | Select |
| Audio is muted by default |
The cart's battery save is kept in this browser's IndexedDB, keyed to your ROM's PRG hash, so two revisions of the cart cannot overwrite each other. Verified to survive a page reload. Clearing site data erases it. There are also explicit "Flush save now" and "Erase battery save" buttons. Save inside the game before exporting a backup. Clearing browser data can erase progress.