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Decompiling a Nintendo 64 Game in 84 Days

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Why This Matters

The rapid decompilation of Snowboard Kids in just 84 days highlights how advancements in AI and collaborative efforts are accelerating reverse engineering processes in the gaming industry. This progress enables deeper understanding of game mechanics, fostering innovations in modding, speedrunning, and preservation efforts for classic titles.

Key Takeaways

26 Aug, 2026

I’m very pleased to announce that the original Snowboard Kids is now 100% decompiled! This means that all functions have matching C implementations that, when compiled, produce identical machine code to the original game.

This was obviously not a one-person effort. I am particularly grateful to inspectredc, Bl00D4NGEL, and queueRAM for their significant contributions to the project. No amount of AI would have been able to replace them. I would also like to thank iFuzzle, JamesBLewis, and douglasjv for lending their tokens to the cause.

My hope is that a full decompilation will prove useful to the Snowboard Kids community. Speedrunners in particular have long focused on the first game. Working source code can help shed light on externally observed phenomena such as CPU pathing and the exact factors contributing to player speed. A full understanding of the source code will also be useful for static recompilation and more ambitious modding efforts in the future.

The speed at which the project was finished is also noteworthy. Snowboard Kids took only 84 days to decompile compared with 596 days for Snowboard Kids 2, roughly one-seventh of the elapsed time.

Weekly progress of the Snowboard Kids decompilation.

What explains this difference? Well, it’s 2026, so the answer is at least partially AI. But it would be a gross oversimplification to attribute the difference entirely to LLMs.

What Was Different

To state the obvious, I was not starting from scratch. By this point I had already spent nearly two years on a similar project and was vastly faster than when I began. This advantage is difficult to quantify and was somewhat offset by new challenges such as working with a different compiler.

Overall, roughly 4.8% of matching commits involved expert intervention. I have already credited these amazing people once, but it’s worth reiterating. This project would not have been possible without significant help from the decompilation community, particularly inspectredc, queueRAM, and Bl00D4NGEL <3.

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