War Room mode is a game mode in the Advance Wars series in which players are pitted in a variety of missions against an opposing CO or CO's in a variety of different circumstances.
The objective of each War Room mission is the same: to Capture the Enemy's HQ or HQ's, or Rout all opposing forces. But the true challenge of War Room is to see how high your score is for each mission, which goes as high as 999 in Advance Wars, but as high as 300 in Advance Wars 2: Black Hole Rising and Advance Wars: Dual Strike.
While War Room mode did not exist in Advance Wars: Days of Ruin, it was replaced with Trial Maps that could be completed alongside the game's Campaign. This included some maps that were previously War Room missions, along with some Multiplayer maps.
 See Also
Related ThreadsJondog's War Room - last post by @ Jun 2, 2008
design maps and campaigns and War Room etc. - last post by @ Jan 1, 2008
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THE WAR ROOM HELP THREAD - last post by @ Jul 17, 2002