When Nvidia announced the Android-based Shield console, it came with a simple promise: the experience you'd expect on a full-sized gaming machine, shrunk to a 5-inch screen and either powered by the Shield itself or streamed from a home PC. The first effort was promising but rough, and it's spent the past year and a half building on that original idea. In late 2013, it started publicly testing a service called Grid, which allowed Shield owners near its San Jose data center to stream eight games for a couple of hours at a time. For the time, the service worked beautifully, but it was never billed as more than a test, and there was no indication of how well it would work on a large scale. A year later, we're about to find out.