Games first released on NES, ported to run in your browser.
5 games

Contra NES Native Port
Contra
Originally on NES
Works on mobile, Needs your own game files
z2rs
Zelda II: The Adventure of Link
Originally on NES
Gamepad support, Needs your own game files
Duck Hunt JS
Duck Hunt
Originally on NES

ZQuest Classic
The Legend of Zelda
Originally on NES
Works on mobile, Gamepad support
Cattle Bity
Battle City
Originally on NES