Garry's Mod (2006)

Garry's Mod, released in 2006, is a physics sandbox that throws you into a world of limitless creativity. The game provides the tools, and the rest is up to you. Build anything your imagination can conjure: vehicles, elaborate machines, or even the utterly bizarre. With no set objectives, you're free to experiment, construct, and collaborate with others. Whether you prefer solo building sessions or online multiplayer madness with thousands of players, Garry's Mod offers a playground for every kind of player. What firmly places Garry's Mod on the list of "Best games by Valve" is its incredible community and the endless content they've provided. From the hugely popular Trouble in Terrorist Town to the thrilling Elevator: Source and countless custom game modes, maps, and models, the community has expanded the game's potential beyond measure. The vibrant Steam Workshop further fuels the experience, offering a staggering amount of free content to enhance your builds, tools, and overall gameplay. Although Valve didn't directly develop Garry's Mod, the community's creativity and the game's integration with other Valve titles firmly solidify its place among Valve's best.