Command & Conquer: Generals β Zero Hour is a 2003 expansion for the real-time strategy game Generals , introducing new campaigns, specialized "Generals" for USA, China, and GLA factions, and the Generals' Challenge mode. Following the release of the source code by Electronic Arts in 2025, the community is actively developing, patching, and playing the game on modern systems. For a detailed overview of unit stats and base building, consult the Command & Conquer: Generals - Zero Hour - Official Strategy Guide .