Responsible for countless amusing images and experiences, Garry Newman's self-titled Source mod "Garry's Mod" has been briefly marked down 50% to $5 on Steam.

Initially released on Steam in 2006, the paid download lets you bring models from various games into an open sandbox and play with them accordingly. Since then, it's brought in over $3 million and given creator Newman financial stability.

"This game requires that you own a Source engine game such as Counter-Strike: Source, Half-Life 2, or Day of Defeat: Source, cautions the program's official description. "Click here for a full list of games that meet this requirement. Please note that Portal: First Slice and the bundled Half-Life 2: Deathmatch do not fulfill this requirement."

The half-price sale runs until September 21. Thanks to JediDwag for the tip.

It's been a little over two years since Garry's Mod hit Valve's digital distribution client Steam. In that time, it's sold 312,541 copies. Assuming each copy sold for the full $9.99 price, that the popular Garry Newman-created mod has brought in over $3.12 million.

"GMod hasn't just given me financial stability," Newman wrote on his blog, as noticed by Big Download. "It's also made me a lot more experienced in c++. I learned how game engines are meant to work. I got to fly to Valve HQ."

The Source engine-powered mod allows users to bring models from various games into an open sandbox and play with them accordingly, often resulting in hilarious antics and videos. To run, it requires at least one Source engine-powered game.

"I got to tell a nice bearded fellow how I was sick all over myself in the shower after eating airline food, and then realizing I was talking to Warren Spector," he added.

Newman also extended his thanks to the whole of Team Garry, which have been instrumental in maintaining and updating the ever-popular mod. For more on Garry's Mod and its creation, check out our interview with Newman himself.

In a new weekly series, I'll be speaking with both modders and professional developers on the state of the mod scene. This week I chat with Garry Newman, creator of the physics-based playground Garry's Mod. Check it out.

I don't know what's going on. You've got these big-ass mods like Black Mesa that have awesome graphics, but they've been in development for three years and all they've given us is 64 highly sharpened screenshots. But on the other hand you've got these great mods that are released, like Insect Infestation, and hardly anyone's playing. It kind of pains me to see that Insect Infestation isn't making much of a splash. It's doing everything right. It's different, it's releasing regular updates, but no one's paying attention.