A couple key points:
Remember these Rating are "opinions" from humans. Since humans tend to see things differently at times, these ratings are good guides but not a replacement for parental involvement. GameDemo.com lets you try games before you buy, allowing you to see if "you" feel the game is appropriate.
The ADULTS ONLY(AO) Rating is not listed because we will not post such material on GameDemo.com This is not a moral stand, it is just we heard that there is one or two website out there that may feature this type of material and we see no need to add our two tissues xxx cents I mean cents to the mix. Also we do not post 'real' online gaming - were real money can be lost. If you lose all your money gambling than you can't buy the next great game and then my wife can't go to Target and then she is not happy and then I am not allowed to be happy.
E (Everyone) Titles rated E (Everyone) have content that may be suitable for ages 6 and older. Titles in this category may contain minimal cartoon, fantasy or mild violence and/or infrequent use of mild language.
E10+ (Everyone 10 and older) Titles rated E10+ (Everyone 10 and older) have content that may be suitable for ages 10 and older. Titles in this category may contain more cartoon, fantasy or mild violence, mild language, and/or minimal suggestive themes.
EC - (Early Childhood) Titles rated EC - (Early Childhood) have content that may be suitable for ages 3 and older. Contains no material that parents would find inappropriate.
M (Mature) Titles rated M (Mature) have content that may be suitable for persons ages 17 and older. Titles in this category may contain intense violence, blood and gore, sexual content, and/or strong language.
T (Teen) Titles rated T (Teen) have content that may be suitable for ages 13 and older. Titles in this category may contain violence, suggestive themes, crude humor, minimal blood and/or infrequent use of strong language.