Version 1.0 Jnes v1.1 - February 20,2012 Added & Improved Cheat Code Supported for.: (J) = Japen (JU) = Japan and USA (JUE) = Japan, USA and Europe (UE) = USA And Europe (U) = USA (E) = Europe (F) = France (G) = German (I) = Italy (UNL) = Unlicensed
Make sure you are not using a Hack\Different Version\or another Region. Game Genie Codes only work on the Good (U) Rom Versions and Pro Action Replay Codes work on all Regions provided it states what region the codes are for.
A Game Genie Cheat Code is used by the Game Genie Cheat Device for the NES Console. The codes are encrypted and have to be loaded into the game for the code to take effect as they Modify the ROM not the memory.
So when you see a [Game Genie] Symbol in the Cheat Dialog Note Section you know that means its a Game Genie Code that needs to be enabled either before the game is loaded or the game reset (F1) after it is enabled.