San Francisco — Rocket Ninja, a San Francisco-based developer of social games and apps, said on Thursday it has emerged from stealth mode with $3.5 million in its first round of funding. Investors were not disclosed. The company, which has been operating under the radar for the past two years, recently launched its first product on Facebook, called Ocean Kingdom. It currently has several other titles in production for release in the next six months, and is completing development of a streaming 3D engine codenamed Shr3D. Rocket Ninja is led by CEO Oded Pelled, a former managing partner at 22 Group and founder of GetFit.com and Best-TV.com. Randy Fish also serves as CTO and Neil Haldar as executive producer. "In the next year, social games will explode from shallow, repetitive interactivity to more complex, engaging entertainment," said Pelled.