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Bordenhaus Synergy

Half-Life 2 cooperative campaign — grab a crowbar.

▶ Join via Steam
Server: hl2.bordenhaus.com:27015
On the LAN: connect 192.168.68.91
In-game console: connect hl2.bordenhaus.com:27015

Need the game? Synergy is a free mod on Steam — install Synergy, then hit Join. Requires that you own Half-Life 2.