The world’s largest toy fair in the German city of Nuremberg is focusing on games and toys for adults this year. It opened on Tuesday and experts believe this high-spending target group has great potential for the industry. This year some 2,000 exhibitors from 70 countries are displaying their wares at the fair. Toys that appeal to more than just children are part of the corporate philosophy of wooden building block manufacturer Kapla. “The adults don’t just play with the children to give them a treat,” inventor Tom van der Bruggen said. “They have fun with it themselves, and the children feel…