I only have a CDI of Hellgate (Called Hellgate v2 on the CDI filename for some reason). I'd be interested to see if there's a fully functional GDI.
Hellgate is a kind of futuristic 3D racing/shooting game set in Hell. I've found some information on The Dreamcast Junkyard etc but it's sparse. It was never completed, and is quite buggy. However the main menu has a Web Browser option at the very bottom. On the CDI build, selecting the Browser crashes the game and causes the console to reset - this is common in CDIs (and some GDIs) where the feature has been deleted by the person truncating the image size. Because this game is incomplete, it's possible the browser was never installed in the first place, but I'm trying to find a GDI image that might give me a better idea.
I guess what I'm interested in is what online functions the game may have had, and if there's any information on them? We recently discovered online modes in Sega Extreme Sports (PAL only) and this is another title with overlooked online connectivity.
::EDIT::
Okay there are online multiplayer modes.
Game Start will take you to a single player open-world style story mode.
Time Trial will give you the option to Connect To The Internet to "Get The Latest Scores" before you play
Deathmatch will give you Split-Screen as expected, but also a Link-Up and an Internet Deathmatch option.
Obviously attempting to connect doesn't work, though the rotating planet icon appears in the top right corner of the screen.
So this game definitely included (or was planned to include) the following;
Web Site (via Browser)
Leaderboards (Get Latest Scores)
LAN Link-Up Multiplayer (Deathmatch)
Internet Multiplayer (Deathmatch)
Are we able to try and find out more about this game?