Half-Life: Opposing Force: Sandbox file
This is the original mod, but for Opposing Force! You do not need Half-Life: Sandbox to play this... yet
Source: moddb.com
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Half-Life: Sandbox v1.7 file
This file is required to play Half-Life: Sandbox! Make sure you put sandbox files in your directory folder.
Source: moddb.com
Half-Life: Sandbox v1.6 file
This file is required to play Half-Life: Sandbox! Make sure you put sandbox files in your maps folder.
Source: moddb.com
Half-Life: Sandbox v1.5.1 file
This file is required to play Half-Life: Sandbox! Make sure you put sandbox files in your maps folder. This file also introduces Co-op for the first time...
Source: moddb.com
Half-Life: Sandbox v1.4 file
This file is required to play Half-Life: Sandbox! Make sure you put sandbox files in your maps folder. This file also introduces Co-op for the first time!
Source: moddb.com