Emma Roberts is helping Bono and Bobby Shriver’s AIDS-fighting organization (RED) promote a new iPhone game that raises awareness and money for the cause. Julia Roberts’ niece will take to Twitter today to answer questions about the game, (THRED), described as “an abstract 3-D world” with “ever-shifting obelisks” and “living dragon-like gateways.” It’s free to download but has paid upgrades, with proceeds going to the Global Fund for HIV/AIDS programs in Africa.