From: San Diego, Ca.
If you have your original Duke3d CD, then grab the Hi Res Pack, it makes it a very good looking game (eye candy wise) and you get the great gameplay that Duke had; of which I think is missing from most games of its ilk today - personality. While you're Googling, look up some tools for playing Duke3d online in multiplayer mode.
P.S. The Hi-Res pack updates the game for play on Windows (i.e., not in a DOS environment) and thus you it has full mouse-look controls just like any contemporary 3d shooter. Really a blast...my kids and I have spent many hours playing it via LAN.
Funny, I was just thinking about how I would go about doing this for an upcoming LAN party with some old friends. DN3D was what we used to play many years ago, (COOP Mode) and it was great fun. I would run a batch file that would load the nic drivers and hook up using RG6 coax. No Windows. Bare DOS.
But yeah, the low res graphics were the only let down of the game by todays standards. So I'm taking a look at the hi res pack right away. Cool !
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