The sigma_core.zip file you have requested: Maps Levels Missions / Miscellaneous / The Sigma Core - 27.56mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:

Mapname : The Sigma CoreFilename : qxd3sp1.mapqxd3sp1.cmqxd3sp1.procqxd3sp1.aas48qxd3sp1.aas96qxd3sp1.aas_mancubusqxd3sp1.scriptRelease Date : October 22, 2004Supported Gametypes : Single PlayerAuthor : Ryan "Quaker-X" Rut Sigma Core extends the story of the game. Has some pretty cool gameplay and visuals. There are lots of enemies, and plenty of surprises to keep you on your toes.

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