You need a copy of an NES emulator (like Nesticle) and the Legend of the Ghost Lion ROM to play this.
Also, if you want to hack savestates you'll need the program for it. For the emulator, I suggest
Zophar's Domain. As for the ROM, you can probably find it by searching Google. Search for "Hex Editors" here for a good hex editor (I use Hex Workshop).
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