AI is making video game mashups easier than ever

If your social media feed is tuned to video games, you may have noticed a strange trend recently: clips of streamers playing bizarre mashups of popular titles. Skyrim recreated in Minecraft, Halo with Mario as the main character, or Skate 2 maps imported into Call of Duty. These professional-looking fan mods are amusing for half a minute, but they raise serious questions about how they were made and what it means for the industry.

The answer, unsurprisingly, is AI. After some investigation, it is clear that these mashups are not just AI-generated videos but the result of AI-assisted coding. A recent development is that Anthropic's AI model Claude has become remarkably good at decompiling video game code. Games are written in human-readable code and then compiled into binary that computers run. Decompiling reverses this process, revealing the source code that can be edited. This used to be extremely labour-intensive, but now AI can do much of the work overnight.

Claude can reportedly produce a game's source code from its compiled version in a matter of hours. If you ask it to combine two games, it will help with that too. Human involvement is not zero; the best mashups still require significant tweaking by skilled modders. But the barrier to entry has collapsed. What once took months of dedicated work can now be done in an evening, even by those with limited coding knowledge.

To test this, a journalist with no coding experience asked Claude how to create a mashup of an obscure game and a popular one. The AI provided detailed instructions and background on modding tools, but when the journalist admitted confusion, Claude simply built a playable version in a browser within four minutes. It was crude, but good enough for a short social media clip. The journalist noted that they had not really made anything; the machine had done it all.

Those with real technical skills have gone much further. Recent games like Zelda: Tears of the Kingdom have been seen running in web browsers. GitHub hosts open-source code for game launchers that draw from emulated codebases, effectively offering vast libraries of retro games for free. Most notably, PlayStation 5 emulation has advanced dramatically, allowing many PS5 games to run on PC without cost.

Much of this activity is clearly illegal. Some argue that it is a justified response to Sony's move away from physical games, claiming that if a game is no longer available for purchase, downloading it is not theft. Nintendo Switch emulation has also become astonishingly easy thanks to AI-assisted launchers with clean interfaces. In the past, accessing such content required secret knowledge; now it is readily available.

The implications for game publishers are enormous. No company wants its game's code freely available online for anyone to modify. AI is built on the use of creative work without permission, as writers and artists have long complained. Until now, corporations have been less affected. But as AI begins to disrupt the gaming industry itself, some wonder whether AI companies will finally be forced to slow down.

A new era for modding

For years, modding has been a beloved part of gaming culture, often supported by developers. But AI-assisted decompilation changes the scale and speed of what is possible. It allows not just small tweaks but wholesale recreations and combinations that were previously unimaginable. This raises questions about where the line is between creative fan work and outright piracy.

Critics argue that AI tools are effectively enabling copyright infringement on a massive scale. Supporters counter that they democratise game development and preserve titles that might otherwise be lost. The debate is likely to intensify as the technology improves.