For iPhone gamers of a certain age, a wave of nostalgia just washed over them. A week after Apple’s policy shift, a Game Boy emulator called iGBA has become a surprise hit on the App Store.

This is a big deal. Retro game emulation has been a contentious point between Apple and gamers for years. Apple’s App Review Guidelines previously prohibited apps that could run code from unauthorized sources, which basically shut down any chance of emulators appearing officially. But a recent update to the guidelines opened the door for these throwbacks.

iGBA’s arrival is significant not just because it lets you play classic Game Boy titles on your iPhone, but because of how quickly it shot up the charts. This suggests a large, pent-up demand for retro gaming on iOS devices.

The article mentions some uncertainties surrounding iGBA. It’s unclear whether Apple will allow emulators to work with all game libraries, and there’s also the question of how Nintendo, the owner of the Game Boy and its software, will react.

One thing’s for sure, though: if iGBA is any indication, Apple’s new policy could lead to a resurgence of retro gaming on iPhones. So dust off your favorite Game Boy titles and get ready to relive your childhood!