Fire up C&C 3 and load a Skirmish game. Pick the new map, and use the default settings. Inevitably, things aren’t going to be perfect. Here, the first problem is that the border is too tight: Player 2 actually starts in the Fog of War, and can’t build anything as a result. To fix this, go to Resize, and increase the map or cut down the border. Second, the main road is broken; fix it by deleting the extra segment, and dragging the end of it to the map in one smooth line.