Lizzie McGuire: On the Go! (GBA)
CheatingDome.com
All Games and Fun with Friend options
Choose "PDA" from the main menu then select "Best Friends" and add the following name (All in lowercase): cheater.
Mini-Games
Get to level 20 in the Attack Of The Cheerleaders to unlock two mini-games. For every five levels onward, you will unlock two more mini-games.