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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.
Half life is the original game that was created by Valve that made them so rich and big. Half life: Source is the exact same game, but in the Source Engine. The Source Engine is the game engine that games like Team Fortress 2, Half life 2, and Portal use. Half life: Source is also said to have slightly upgraded graphics. It can also be used as content in mods or in Garry's mod.
Only for the half life 2 version of garry's mod.
Gordon Freeman
No it is not. It requires one of the games in the half life 2 series such as TF2 portal or half life 2.