Left Behind: Eternal Forces is a Christian real-time strategy game developed and published by Inspired Media Entertainment (formerly Left Behind Games) for Microsoft Windows. It was released on November 7, 2006. The game is based on the evangelical Christian Left Behind series of novels.
The game features a single-player campaign and an online multiplayer mode.
In the single-player campaign, the player controls the Tribulation Force, a Christian group in a post-Rapture New York City, who are combating the influence of the Global Community, the world government led by the Antichrist Nicolae Carpathia. The player directs the actions of the main characters (Rayford Steele, Cameron "Buck" Williams, Chloe Steele, and Bruce Barnes) and the Tribulation Force's units in an effort to defeat the Global Community by converting neutral and Global Community-allied civilians to their side, or by using lethal force when necessary. The player is encouraged to use conversion over violence when possible, as killing causes the "spirit level" of the player's units to drop. If the "spirit level" of a player's unit drops too low, the unit will turn neutral or defect to the GC, which can cause the player to lose the game.
In the multiplayer component of the game, up to eight players can compete online against each other in teams, with one team playing as the Tribulation Force and the other playing as the Global Community.
In December 2006, Left Behind Games announced an expansion pack for the original game which was scheduled to be released on November 15, 2007. Gamespot news reported in an interview with CEO Troy Lyndon that Inspired Media Entertainment had signed a deal with Big Huge Games, creator of Rise of Nations and its spin-offs, in order to use the Rise of Nations engine to produce a sequel to "Eternal Forces" instead, titled Left Behind II: Tribulation Forces.
The sequel was released in April 2008, and features new graphical building enhancements, a new neutral faction (the American Militia Forces), 5 new missions, and 2 new maps. In May 2008, a version 1.05 update was released.