Super Mario Bros. 2
You supply your own Super Mario Bros. 2 (USA) (Rev 1) ROM; it is read in the browser and never uploaded. ROM body sha1 ff5bcacf7417b4de1c49f9e54c2905d91391455b (262,144 bytes; a 16-byte iNES or NES 2.0 header on top is fine). The earlier (USA) revision and Super Mario USA (Japan) are recognised and will run too.
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, duck, climb |
| X | A (jump) |
| Z | B (run, pick up, throw) |
| Enter | Start |
| Shift | Select |
| Gamepad | supported through EmulatorJS |
The cartridge has no battery, so there is nothing for the game itself to save. The page keeps an automatic save state in this browser's storage, keyed by your ROM's SHA-1, written every 15 seconds and when you leave the page, and restores it next time. Clearing site data removes it; there is a button in the footer to discard it. Save inside the game before exporting a backup. Clearing browser data can erase progress.