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Support for this product is provided by:
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Publisher
Valve
Developer
Gearbox Software
Single-player
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Title: Half-Life: Opposing Force
Genre: Action
Developer: Gearbox Software
Publisher: Valve
Franchise: Half-Life
Release Date: Nov 1, 1999
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System Requirements

Windows
macOS
SteamOS + Linux

    Minimum: 500 mhz processor, 96mb ram, 16mb video card, Windows XP, Mouse, Keyboard, Internet Connection

    Recommended: 800 mhz processor, 128mb ram, 32mb+ video card, Windows XP, Mouse, Keyboard, Internet Connection

* Starting January 1st, 2024, the Steam Client will only support Windows 10 and later versions.
    Minimum: OS X Snow Leopard 10.6.3, 1GB RAM, 4GB Hard Drive Space,NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher Mouse, Keyboard, Internet Connection
* Starting February 15, 2024, the Steam Client will no longer support 32-bit games or macOS 10.14 or lower.
    Minimum: Linux Ubuntu 12.04, Dual-core from Intel or AMD at 2.8 GHz, 1GB Memory, nVidia GeForce 8600/9600GT, ATI/AMD Radeaon HD2600/3600 (Graphic Drivers: nVidia 310, AMD 12.11), OpenGL 2.1, 4GB Hard Drive Space, OpenAL Compatible Sound Card