They're not stupid - Advertising to children

Advertising targeted at children does not necessarily exploit their inexperience in business and does not unlawfully urge them to buy. The Federal Court of Justice (BGH) has now dismissed a corresponding injunction action by the Federation of German Consumer Organisations with a judgment dated April 3, 2014 (I ZR 96/13 – Certificate Campaign).
Advertising to children in online games is not permitted.

Advertising in online games that targets children is impermissible under competition law. But when is advertising to be classified as a direct sales appeal to children?
Peek & Cloppenburg Hamburg vs. Peek & Cloppenburg Düsseldorf

The First Civil Senate of the Federal Court of Justice (BGH), which is responsible for trademark law, recently ruled in five cases on the question of how nationwide advertising by companies with identical company names must be designed.