Game streaming audiences are growing rapidly, with over 660 million people worldwide watching over 44 billion hours of game videos annually as of today. By 2020, those numbers are projected to increase to over 1 billion people watching more than 55 billion hours per year. Developers can design games for sub-second livestreaming interactions to better engage these large audiences by aligning viewers with streamers' goals, making the audience role meaningful, and providing feedback to viewers for their in-game actions. Various game engines and SDKs exist to facilitate this type of interactive streaming.