When you select the Multi-Player section, you can select to join a game, or 
create one.

When you join one, you can set a filter, or connect to an IP of someone you
know.

When you select to create a server, you can select various gametypes:

* Deathmatch - Kill (frag) as many other players as you can. When you killed
  the most players, you win.
* Team Deathmatch - The same as Deathmatch, but you work with teams this time.
* Last Man Standing - You have to survive as long as possible.
* Tourney - You'll fight 1 vs. 1, and others specate. This way a winner is
  selected.
  
You can set things like a frag limit, time limit, max. players, spectars,
warm-up, password etc. When it's all set, you can begin.

You can find 3 items in Multi-Player; Berserk, Mega Sphere and Invisiblity.
These are described in the "Other items" section. Multi-Player comes with all
weapons, excluding the BFG and Soul Cube.

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Tomiko Reactor                                                      [D3.05.02]
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This level has two levels, and the Berserk power-up. To find the Berserk
power-up, you'll have to find the Tomiko Reactor. Once there, wait till the
laser beam stopped, and drop down. Grab the Berserk and you'll get teleported.
This map uses parts from the Single-Player map Central Server Banks.

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Delta Lab                                                           [D3.05.03]
==============================================================================

This level also has two levels, and the Mega Sphere power-up. Find the machine
that can generate the power-up. You'll have to wait 20 seconds before you are
able to grab it. This level looks like the Delta Labs, but that shouldn't 
come as a surprise ;p

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Frag Chamber                                                        [D3.05.04]
==============================================================================

This map comes with 2 power-ups; the Mega Sphere and the Invisiblity. The
invisibility power-up can be found by using the panel to active the chamber.
Everyone inside will get crushed. Once the process is done, the power-up will
appear. This map uses parts of the map Alpha Labs Section 4.

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The Edge 2                                                          [D3.05.05]
==============================================================================

The biggest Multi-Player map of Doom 3. Use the barrels and lights as you
advantages. You can reach a Berserk power-up through a teleported (the blue
beam). This map uses parts of the Caverns.

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Lights Out                                                          [D3.05.06]
==============================================================================

To find the Backpack in this level, you'll have to shoot the UAC logo and go
down the stairs. You can use the generator in this level to put the lights 
off. However, there is a bug in the game which allows other players to still
see others, because of the shadows. There is an invisiblity power-up in this
map.