Half-Life: Opposing Force

About Half-Life: Opposing Force

Opposing Force returns to the same setting as Half-Life, but instead portrays the events from the perspective of a U.S.

Gearbox Software's Half-Life: Opposing Force is a platform, puzzle, and shooter game, published by Sierra Entertainment and Valve.

It arrived in November 1999 and is playable on Linux, PC (Microsoft Windows), and Mac.