An Instant Action map by ptrain.
1. Go to your Crysis Wars level folder: -> Electronic Arts/Crytek/Crysis WARS/Game/Levels/Multiplayer/IA.
2. Eventually backup a existing Level folder with the same name.
3. Extract the levelfolder from the downloaded archive if necessary by using an extracter such as 7-zip.
4. Copy the downloaded levelfolder into the IA folder.
5. Start Crysis Wars
6. You can create a lan or internet server, put the level into the rotation and play.