For a complete list of Dreamcast system link titles, please see the following URL:

http://dreamcast.onlineconsoles.com/..._gameslist.php

Note: Remember to click on each region area for the compatible system link games in each region.

You will need a Dreamcast VS Cable, which is a serial link cable that connects via a port in the back of the DC. They are pretty hard to find these days, so eBay is your best bet.

-nikon