Blood, based on the BUILD engine that powers Duke 3D, its not vastly different, save for the psuedo 3D models they have, built with sprites, etc. I don't know if the actual Blood engine is open source, but the Duke 3D source is, and I doubt they made that many extras for Blood. Would be a great engine for building new games on, since its requirements are much like Duke 3D's, yet a bit prettier in places than Duke, like the 3D gravestone sprites, and would be a superb basis for game developers too.
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