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gm_BlackMesa_Sigma is a map made by SuspiciouslyAwesome that is set in the Black Mesa setting. The map contains Ai-nodes and HDR in every part of the map. It is one of the earlier maps made during the beginning of GMod 13. The map contains offices, helipads, shipping crates, a lobby, 2 islands, a core, and a portal leading to a part of Xen. It is very popular within the GMOD roleplay community as many players like to reenact the Pre/Black Mesa Incident.

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