A developer who made gaming history with a legendary emulator speaks publicly about his work for the first time. In his first interview, he reveals what drove him back then and how his love for retro games has now led him to a personal project on Steam.
Who is it about? The programmer “zsKnight” programmed the Super Nintendo emulator ZSNES as a teenager. In his first interview with YouTuber “Zophar”, he talks about the development and why he kept his identity secret for so long.
At first, he only wanted to test basic graphics commands of the SNES. But it quickly turned into a complete program, whose speed on PCs of 1997 was very fast for those times. Although he initially did not believe he would ever achieve stable frame rates (via pcgamer.com).
A technical marvel between innovation and gray area
What made the emulator so special? ZSNES was not only fast but also offered some extras. The “Snowy UI” (snowflake interface), which was particularly praised in the community, was the distinctive menu design of the emulator. Instead of classic windows, it displayed a pixelated, gray-blue interface with an animated snow effect in the background.
To enable online matches, which were a real rarity in 1997, he invented a trick. The game simulates what the opponent might do next so that everything can be displayed without delay.
When the actual input arrives later and is different, the game briefly “rewinds” and corrects the scene in the background. This creates the impression that everything is happening in real time, even though there is actually a small time difference between the players (via pcgamer.com).
From emulator to personal game on Steam: The developer has since opened a new chapter. With Retro Endurance 8bit he made his debut on Steam. The game consists of several mini-games that are connected into an endless arcade experience. Originally, he programmed the project for his children; today it is a complete 8-bit title available on Steam for 3.99 euros (price as of 29.10.25).
Why did he keep his identity secret? Despite the success, the programmer remained anonymous. In the interview, he admits that he did not inform even close friends and his parents that he had developed ZSNES (via pcgamer.com).
He was still a minor at the time and did not know if there could be legal issues with his software. In fact, emulation programs themselves are not illegal; they merely simulate the hardware (via mcneelylaw.com).
The difficulty lies with the games: The situation regarding ROMS is legally controversial since it does not clearly clarify when copyright infringements occur. Emulators are often tolerated until they are misused for piracy. For this reason, Nintendo sued the developer of a Switch emulator. The fear of such lawsuits was one of the reasons why “zsKnight” kept his identity secret for over two decades (via pcgamer.com).
What does Nintendo itself think about emulators? The corporation behind the Switch regularly takes action against fan projects and unlicensed emulators, but internally uses similar technology to make old classics playable again on new consoles like the Switch.
