Mobile gaming is still waiting for its killer app, says Vivendi Games CEO Bruce Hack. But Hack believes that LBS--along with 3G services that offer the prospect of peer-to-peer game play--will spark a "revolution" in the "2 billion mobile handsets that are out there." While mobile games are still only a small part of Vivendi's business, Hack sees a bright future and is happy his company is taking the first few steps. Interview