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[7Soul]

At NESBox.com you can play any NES and SNES game, including The Guardian Legend!
You can play the original japanese version, the american version and there's even a russian fan translated version

[arseniy]

There is great Java browser emulator(and absolutelly legal, that's why not all of the games there):
http://www.virtualnes.com/
It runs very fast(no lags even on pretty old PC) and has stereo sound.
Here is Guardian Legend:
http://www.virtualnes.com/play/?id=NES-GD