The Nintendo Wii will feature parental controls, prohibiting young viewers from viewing inappropriate content. This allows parents to set the age level of the system, and when a disc is inserted, it will read the content rating encoded on the game discs; if this rating is greater than the system’s age level setting, the game will not load unless the user correctly enters a password to override the setting.
For instance, a game carrying an ESRB rating of M for Mature, which is intended for those over the age of 17, will not play on a system that is set to only allow games rated E for Everyone (six and older) and EC for Early Childhood (three and under).

This will be found in all systems released around the world; it is confirmed that the European units will use the PEGI rating system, North American units will use the ESRB rating system, units for the Japanese market will presumably use the CERO rating system, German units will use the USK system, and Australian units will use the OFLC system.