In many video games, players share the point of view of a character in a virtual world. But Rosenfield wanted his game to feel more like a physical puzzle, such as a Rubik’s Cube.
That’s why he and Rivera decided to put Quill on a surface that could tilt in different directions. To make the motion realistic, Rosenfield used the accelerometer built into mobile devices. This instrument senses how a phone or tablet is oriented in space. Rosenfield wrote code that communicates with the accelerometer. When you tilt your device, the code tells Quill which way to roll.
It took Rosenfield and Rivera three years to build Tilt. It’s their first mobile game, but they’re excited to make more. In fact, they’re already working on a sequel to Tilt. “I didn’t realize how cool it was to make a game like this,” says Rivera.