Want to feel small and unintelligent? Try talking to a 12-year-old code ninja about video game designing. Because when not-yet-a-teen Justin Kolodziej started explaining how he had self-designed a ...

It seems like a remarkably low-tech question to overhear at Code Ninjas, an education center where kids learn coding programs such as Scratch and Java. But inside the "dojo" — an open-layout activity ...