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The Sigma_Core.zip file you have requested: Maps Levels Missions / Single Player / S to T Titles / 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:

My first single player level created for Doom 3. Built in about 6 weeks, the Sigma Core extends the story of the game and offers up unique gameplay and visuals. Plenty of enemies, and a long journey to keep you on your toes at all times.- Quaker- My first single player level created for Doom 3. Built in about 6 weeks, the Sigma Core extends the story of the game and offers up unique gameplay and visuals.

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