42: Sphero 2.0
The Sphero is a robot ball that you control with a smartphone app. It glows. Its motor can push the ball to a hair under 5 miles per hour. It runs through obstacle courses. Improve your navigation skills, and you’ll be rewarded with level-up rewards—like extra boosts of speed, or Rainbow Drive, which makes the ball glow in different colors at full brightness.
And there’s an SDK. One third-party app lets you use Sphero to practice your golf swing. Other apps tap into augmented reality.
Let us repeat: It’s a smartphone-controlled robot ball. What are you waiting for?