This is just a quick webpage I've thrown together to help you download the networked version of Balls. I don't have precompiled binaries available at the moment, and in any case the source distribution means I can change the code without people needing to download everything again. All it takes is a little initial investment...
You'll need the Balls source code and data files, of course. It should compile with just about anything Allegro supports; I've tried it with gcc in Linux, and Robin Burrows tried it using gcc (Mingw32) in Windows. Alternatively, you can get the source code and data files separately -- the data files are fairly large, and unlikely to change much, so you can just drop in the source on top of your old version to upgrade it this way.
You also need an Allegro WIP; anything reasonably recent will do.
Lastly, you need a copy of Libnet. I expect the most recent release will work fine, but older ones may not be able to connect to newer ones. You might need this snapshot of the version on my hard drive, instead; try that if you have trouble connecting in the game.
I'm assuming you've already got Allegro installed.
Libnet is fairly simple to set up. Unzip it somewhere, and copy a file from the `makfiles' directory to `port.mak' in the top directory. e.g.:
C:\LIBNET> copy makfiles\mingw.mak port.mak
Now you can run `make'. After that, try `make install' but your mileage may vary -- you might need to copy the library binary to your compiler's `lib' directory, and the header file to your compiler's `include' directory:
C:\LIBNET> copy lib\libnet.a \mingw32\lib
C:\LIBNET> copy include\libnet.h \mingw32\include
The final thing you need to do is compile the Balls code itself. Run the fix script for your platform, e.g. fixmingw.bat for Mingw32. This will then give you further instructions -- some platforms have makefiles, others have batch files, some have both, and MSVC has a .dsp project file. Run whichever file is appropriate for you, and the Balls binary will be created in the `bin' directory.
First, after running Balls, go to `Setup' then `Network' and choose a network class. After that you can choose a specific driver in that class, but most platforms only provide one driver in each class.
After this, from the main menu choose `Begin game' and then `Multiplayer (network)'. Set your name using the first option in the menu.
In a networked Balls game, one person must initiate the game and choose the level settings. After this stage, new people may connect to existing people in the game. Currently no more than two players are supported (and one is rather boring).
The initiator must choose `Start new game', and may then adjust the settings before proceeding to the lobby.
Other players choose `Join existing game' and enter the address of a player already in the game. When they have connected, they move through to the lobby too.
In the lobby you see the game settings and a list of players. The lower area is for chatting. Press `Start' to begin the game; this will pull all the other players through too.