Remembered that I had the CD for Half-Life and learned you can put the CD key in to unlock it. Was surprised that I also unlocked the add-ons with this version. : r/gaming
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I just redeemed a 12 year old Half Life Platinum CD key :D : r/gaming
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![OP4:CTF WON version - retail [Half-Life: Opposing Force] [Mods]](https://images.gamebanana.com/img/ss/mods/5d87e93319da2.webp "OP4:CTF WON version - retail [Half-Life: Opposing Force] [Mods]")
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