Which games are useful to put artificial intelligence to the test?

The artificial intelligence (AI) that is already all around us cannot safely drive a car by himself, nor can they write compelling scripts. Still, every day the research to make them more capable gets new results, and in some cases, anyone with a computer and an Internet connection can help teach them something. Both Google and Microsoft have put online some experiments (interpretable as "games") with which to try to understand how to teach a computer to learn, or simply to get an idea of how smart some AI systems that already exist are. Google's can be found on the A.I. Experiments platform, while Microsoft's were mostly created by the Microsoft Garage research community. They are, of course, not the first such experiments.