Things You'll Need
Instructions
Insert the SD card into the USB port on your computer. Windows automatically creates a drive letter for the card. Download the MegaCodeDownloader to your computer.
Right-click the downloaded ZIP file and select "Extract To." In the opened window, choose the SD device drive created when you inserted the SD card into the computer.
Remove the SD card from the computer and insert it into the Wii.
Boot the Wii and load the game you want to play. When you boot the game, the MegaCodeDownloader cheat codes are available within the game.