10 years in the making, retro game emulator Delta is now No. 1 on the iOS charts

When Riley Testut was a sophomore in high school, he showed his friends how to load illicit software onto their bulky graphing calculators. Such behavior was generally discouraged at school, but he wasn’t plotting to cheat on a test. He was simply traversing the Viridian Forest, surfing across the Kanto seas and collecting gym badges.

“The teachers didn’t think we were playing Pokémon,” Testut told TechCrunch. “They were just like, ‘Why is everyone so into their calculators?’”

By 2014, when Testut was a high school senior, the only way to install a retro video game emulator on an iOS device was to jailbreak it. But Testut didn’t want to damage his then-state-of-the-art iPhone 4. So, he spent months building an app that would let him play GBA games on his phone without voiding its warranty. That app became GBA4iOS.

Millions of people swarmed to GBA4iOS, reveling in the glorious experience of playing Game Boy titles on a palm-sized phone. Even Time Magazine wrote about it. But GBA4iOS was too successful for its own good and, soon, Testut had to face an adversary more formidable than Team Rocket: Eight months after the app’s release, Apple patched the loophole that made GBA4iOS possible, quashing his app in the process.

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