Gameshark codes can be used with a Gameshark system, or on an emulated GBA system. All codes must be inputted manually. If the first code does not work, then move on to the next on the list. Each code works for a different emulator or Gameshark system. Be sure to disable or remove codes that do not work or are not in use, as it's possible to over ride your system, which can cause a crash. All codes must be used on a "continued" game. Codes will work on a Gameshark only,