Shanghai-based online game company Giant Interactive (NYSE: GA) recorded 344,005 peak concurrent users (PCU) for its in-house developed 2D MMORPG Giant Online on May 3. The game recorded 237,686 PCU and 614,403 unique users on its first day of open beta testing on March 28. Giant Interactive recorded over 2.1 million PCU for its in-house developed MMORPG ZT Online on April 26.