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Here is a link to a Game Genie Encoder/Decoder. In case you didn't already know, Game Genie codes are created by making patches to the ROM. On real hardware only a few could be used at a time, but I'm assuming most emulators allow more.
To use, first make sure Game Boy/Game Gear is selected. Address is the pointer that will be patched, value is the new value to set it to, compare is the old value, and Game Genie is the code.
You can try to hide yourself in this world of pretend; when the paper's crumpled up, it can't be perfect again.