Half-Life 1 Mods

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Sven Co-Op, a Half-Life 2 Source Mod

∗−Requires Half-Life 2?, Yes
Get HALF-LIFE 2 Now for $23 USD

DOWNLOAD SVEN CO-OP! (sven_co-op.rar) – 6.6 Megabytes (compressed)
http://www.svencoop.com/