The following tutorial we will set up Deathmatch and TeamDeathmatch gametypes. Make sure you have the following gameplay entities inside your map: Player Starts, PathNodes, Weapons, Items, Vehicles (optional), JumpPads.
If you haven't seen the previous tutorial on how to add these into your map, read it out here.
SAVING YOUR MAP
The first thing to do is to save your map with DM- prefix. Even if you do not enable any gametypes in World Properties and do not see weapon or hud, by saving as DM- will automatically enable the DM scenario in game.
WORLD PROPERTIES GAME TYPE
Go to View -> World Properties:
Find Game Type tab. Click on the plus icon and add two entries. Use the drop down menu to set UTDeathmatch and UTTeamGame.
Open up World Info tab and under My Map Info use the drop down menu to set UTMapInfo.
Also set Recommended Players Min/Max.
ADDING MUSIC TRACK
Now we need to set Map Music Info.
UDK by default has 2 tracks you can use without you having to create your own custom set.
Open Content Browser and browse to A_Music_Arrangements packages.
Select one you want to use.
Once selected use it in the Map Music Info.
GAMEPLAY TESTING INSIDE THE GAMES
Fire up the game and set it to your map.
The map will be playable in DM and TDM gametypes.