No. Half Life: Opposing Force does not require neither Half Life nor Half Life: Blue Shift.
Yes
No, only Half-Life and Half-Life: Decay.
Half-Life Opposing Force - 1999 VG was released on: USA: 20 November 1999
Half Life: Opposing Force is an expansion pack for the popular computer game "Half-Life" by Valve. You can learn more about this at the Wikipedia. Once on the website, type "Half-Life: Opposing Force" into the search field at the top of the page and press enter to bring up the information.
Enemies In Half-Life: Opposing Force include Xen creatures, Race X, and Black Operatives. More information on enemies can be obtained on half-life.wikia.com.
Since Half-Life: Opposing Force is an expansion pack, you first need Half-Life and a Steam account. Pay the $4.99 required to own the game, then download it through your Steam client.
Half-Life 1 and it's mods like Blue Shift, Opposing Force, and Team Fortress are rated M for mature players seventeen or older. There is a ton of blood, and dismemberment in them, but nevertheless, they are all great games.
It was actually Otis Laurey, a generic security guard character seen in Half-Life: Opposing Force and Half-Life: Blue Shift who ate all the donuts.See the related links for an image.
Half-Life, Half-Life: Blueshift, Half-life: Opposing Force, Half-life: High Definition pack (might not classify as a game), Half-Life: Source, Half-Life 2, Half-Life 2: Episode 1, and Half-Life 2: Episode 2. Eight games total not including countless mods created by fans that you can download for free on moddb.com and fileplanet.com. Other games by Valve software include Left 4 Dead, Left 4 Dead 2, Portal, Portal 2, Counter Strike, Counter Strike: Source, Team Fortress, Team Fortress 2, and Alien Swarm. Another Half-Life game would be Half-Life: Decay. You might also be able to count Half-Life Deathmatch and Half-Life 2 Deathmatch.
yep
An OPFOR or opposing force is used for training exercises in the military. These individuals represent the enemy in these exercises to create a more realistic encounter. It gives those who are in training a better sense of what they may come across in real life battle and a better understanding of what to expect.
The two opposing forces are gravity, pulling the star in and the outward force from the ongoing nuclear fusion reactions. As the star approaches the end of it's life, changes in the reactions occur, which cause the forces to balance out in different ways, changing the size of the star.
1st answerer: No, you can buy it separately as a standalone game. It also comes with Half-Life 2, however. You can buy it for $10 on Steam. 2nd Answerer: actually $5 on steam now 3rd Answerer: actually most people can get half life 2 Deathmatch FREE + Half life 2 lost coast (on PC). This is a legit steam offer if your computer has ATI graphics card or Nvidia.