Because of ESRB's strict rules on violence, gore, and profanity in video games, Valve had a hard time launching Left 4 Dead 2 in several countries, including Germany and Australia. First, they had to change the original poster with severed fingers on it, as it was too graphic. Then, once the game came out, German players only got the censored version; otherwise, Valve's title would have been banned. In the censored game, there were no ragdoll effects, dismemberment was deactivated entirely, it was not possible to set the enemies on fire, and no spilled intestines were shown on screen. 

In 2021, German gamers finally got their hands on the uncensored version. Valve requested a re-evaluation of the game, and the censorship was lifted, making the uncut version of the shooter officially available in Germany. 7 years prior, Australia allowed the release of the full version as well, though their censorship was originally milder. 

17 years later, Valve writer Chet Faliszek released a YouTube video explaining how much they had to change due to ESRB's policies. That included the characters mentioning drugs and alcohol, even indirectly – one of the examples is Francis saying, "This is the most sober I've ever been". Moreover, those were not allowed in the DLC as well, leaving the writers no room to keep the original language of the game intact. 

Ultimately, Faliszek revealed that the team had to orchestrate the trailer leak because ESRB would not let them release it. With all the restrictions taken into consideration, the Left 4 Dead 2 trailer would have ended up entirely sterile. "A lot of the language gotta get toned down," Chet Faliszek explains – and that is not what the team wanted. 

Back then, most players were too excited to see the trailer, so no one cared whether it was an actual leak or a sneaky launch of the official trailer. As time went on, some users started to notice that Valve had been featuring this very video as their official L4D2 trailer here and there. In 2012, a YouTube user wrote, "Lol at Valve putting this leaked version on the Source Filmmaker showcase", and in 2022, another user noted, "Valve added this to their official playlist".

Last week, Faliszek finally revealed the not-so-big secret, adding, "I think we can't get in trouble for that now. It's like 20 years ago."

The leak was easy to believe, however, because over the years, Valve has had multiple actual incidents. In 2023, a playable Left 4 Dead prototype was leaked online. It's a Counter-Strike: Source mod named Zombie City, and to devoted L4D players, it looks a little too familiar – the mod is basically at the core of what we know as Left 4 Dead.

Then, just a little over a week ago, a mind-blowing 12 TB leak made Valve's early builds publicly available. It contained files from 2003 to 2013 and included never-before-seen materials for Portal 2, L4D, Dota 2, and CS: GO. 

Valve is not alone in this: Rockstar Games have gone to hell and back multiple times with the GTA 6 leaks. First, in 2022, a user named teapotuberhacker published 90 videos revealing around 50 minutes of game footage. Another major leak happened a few weeks ago when Cyberleek published several minutes of game footage, threatening to release more if the publisher sticks to their original sales strategy, which essentially forces players to make numerous purchases to get a full experience. 

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