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If you are just starting with Enemy Territory then you probably don't have any custom maps on your PC. The only maps that come with the installation package are the so-called 6 standard maps (Oasis, Railgun, Fueldump, Radar, Battery, Goldrush).

There are 2 ways you can get new maps:

1. connect to the server you want to play: if the server runs a map that you don't have, you'll download it there on the spot prior to getting on the server. This can be a pain in the back since some administrators are not redirecting their server downloads hence the download rate is very slow, but also because when you connect to a server you want to play and not download maps
2. download maps from the web: there are quite a few websites which host maps and you can easily download any map you want from them. The best of those are:
• New-Maps
• Gameprophets

To make your life a bit easier I suggest you download the following popular maps:

• supplydepot 2
• venice
• frostbite
• braundorf (version b4)
• tc_base
• caen
• warbell

 To install the maps

• Download the map and save it on your Desktop
• If it's a zip or rar file then decompress it (un-zip or un-rar)
• Take the .pk3 file and place it in your Wolfenstein - Enemy Territory/etmain folder

A word of advice to game server administrators:

• Always place the maps in the server's etmain directory and not in the mod's directory (e.g. etpub, noquater, jaymod etc). otherwise connecting players will need to download all maps (and not only the one currently played on the server) prior to connecting.
• Always redirect your server downloads. Read Re-directing your server downloads if you don't know how to do that and How to get a free downloads server if you don't have your own webspace.