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This mod bases off co-op for the gearbox game 'Opposing Force'. All campaign levels, weapons and npcs are included from the original game but ported into Half-life 1 as a modification.

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gta4life55

gta4life55

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Phenixtri

Phenixtri

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Meraqel

Meraqel

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m0u$3[uz]

m0u$3[uz]

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efkaverx

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BillSends

BillSends

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Spy08

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