Command & Conquer Generals: Zero Hour First expansion pack for Command and Conquer Generals Compete with elite commanders for battlefield domination 15 new missions; Generals Challenge mode; enhanced weather effects Hi-tech arsenal featuring 30 new units and 20 new upgrades 25 new multiplayer maps; for players age 13 or older First expansion pack for Command and Conquer Generals Compete with elite commanders for battlefield domination 15 new missions; Generals Challenge mode; enhanced weather effects Hi-tech arsenal featuring 30 new units and 20 new upgrades 25 new multiplayer maps; for players age 13 or older