Time for action – setup, where to save the file, what to name it

1. Go to File | New, a window will pop up asking what geometry style you want, select Additive. Not only is it more appropriate for most level designs, but also I've seen some weird bugs with Subtractive mode in UDK.

2. Before we begin working, let's pick a name and save our file. For the purposes of this test, we'll use DM-CSGTest01.udk. Unreal figures out what game type you're making based on the map name. So by choosing DM-, we'll get a Deathmatch map, and all of the associated gameplay that comes with it as default lead-out. Go to File | Save. Unreal works best if you put your map in a specific folder, which you may have to create as follows:

   C:\UDK\UDK-VersionRelease\UDKGame\Content\Maps and name it DM-CSGTest01.udk.

3. Let's also do some viewport configuration to make editing easier. Click on View | Viewport Configuration | 1x2 Split. This will put your perspective view on the left and your top, and side 2D views on the right.

   

4. Click...