Unterhaltungssoftware Selbstkontrolle ( Entertainment Software Self-Regulation Body in English), abbreviated as USK, is a German video and computer game rating system.
USK 0 (white)
No age restriction. Suitable for children of any ages. Games with rating may have extremely mild violence, no bad language, and extremely mild fear.
Mario & Sonic at the London 2012 Olympic Games
USK 6 (yellow)
Is like USK 0 but children may require their parent's permission in order to play. May include mild violence and fear.
Mario Strikers Charged
USK 12 (green)
Games with this rating are recommended for teenagers. It may include mild bad language, gambling references, and moderate violence.
Super Smash Bros. Brawl
USK 16 (blue)
This rating classification reaches a stage where there is strong bloody violence, frequent swearing, mild pornographic references, gambling and sexual references.
Mass Effect 3
USK 18 (red)
Only adults are permitted to play video games with that rating. It includes extreme bloody violence, dark and threatening atmosphere, pornographic references, frequent swearing, gambling and sexual references.