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However you can still upload to other sites, where people can download them and put them in the game themselves. Since these games don't sync with the Steam Workshop, you can't directly upload your creations to the games, or to the gamers.
Though not in sync with the Steam Workshop, Steam also allows access to other versions of the Source SDK which are compatible with these following games: Left 4 Dead & Left 4 Dead 2, and Half-Life 2, Episode One & Episode Two. The Source SDK currently runs on the following games, all of which sync with the Steam Workshop, allowing anyone to publish their own levels or weapons into the game: Garry's Mod, Day of Defeat Source, Portal 2, Counter-Strike, and most popularly Team Fortress 2. Due to many games being created with the Source sdk, there are many outlets for you to exercise your creativity. The Source SDK is highly acclaimed for it's easy-to-learn interface and creation tools that make it far simpler than most software development programs. Though the Source SDK is a fantastic video game editing program, it comes with it's fair share of flaws that you should consider when making your choice for your ideal software development program, because they could "make or break" your decision to use Source. No doubt that the Source SDK's abilities are far superior to the others, a prime example of why the Source SDK is still used by thousands to date. Compare these graphics from Half-life 2 to the graphics of other popular games of 2004, the same year Half-life 2 was released. Direct your attention to the images on the right, notice the face of Half-life 2's characters, and their deeply detailed facial design. The Hammer editor's amazing graphical abilities of the time, and its flawless performance on computers made it so beloved. The Source SDK, and its primary application, the Hammer World Editor, was a prime example of ahead of it's time technology. And Half-Life, which originally won the same title, is still trailing in the top 10s, even after 15 years. To date, Half-Life 2 is the highest selling FPS on the PC, even with 10 years under its belt. Half-Life 2, the sequel to the 1998 Thriller computer game Half-Life, was released in 2004 and was met with outstanding critical and personal acclaim.
The Source SDK first found its spotlight in its debut with the launch of one of Valve's most famous titles, Half-Life 2.