Arcade meets Gears of War PC meets offline TDM-like gameplay. Lots of features.
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Go to your my games folder, usually under: My Docs\My Games
The .WAR files goes in: \My Games\Gears of War for Windows\WarGame\Published\CookedPC\Maps\CustomMaps
If they don't exist, you will have to create them manually.
WARNING YOU MUST HAVE THE MAIN GAME PACK TO PLAY THESE MAPS!!
(See Download section tab)