Download link: https://gamebanana.com/mods/290154

"Half-Life Shortcut Thru Opposing Force" is a mod that connects sections of Black Mesa as seen in Opposing Force with the sections seen in Half-Life. It allows you to play as Gordon Freeman and gives you the option to enter back into the Black Mesa Transit System and play through the following Opposing Force chapters: We Are Pulling Out, Missing in Action, Friendly Fire, and We Are Not Alone. Once Gordon enters the Lambda Complex portal, the game resumes Half-Life from the chapter Xen, effectively creating a shortcut. The mod is not designed to be a very challenging game, but rather a fun and novel playthrough. This mod runs on your existing Half-Life 1 install so will not encounter any Opposing Force monsters or weapons. For this reason however, many unique surprises await.

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