Bathaxx
Requirements: A copy of "LEGO Batman", a standard SD card (will not work with an SDHC card), and a nunchuck.

1. Load the LEGO Batman game at least once (otherwise you won't be able to copy over the hack).
2. Delete or move\backup your personal "LEGO Batman" save file before copying the files to your SD Card.
3. Copy the ModMii files to the root of your SD card (if you haven’t already) and insert it into your Wii.
4. Go into Wii Options - Data Management - Save Data - Wii - SD Card then copy over the "LEGO Batman" save that corresponds to your region.
5. Start the LEGO Batman game. Load the new save file.
6. You are now in the batcave, take the elevator on the right side.
7. Then in the trophy room, go to the upper corner and go through the door to the "Wayne Manor". Now you can select a character.
8. Choose the last enabled character in the lowest row to launch the exploit.