One of the factors contributing to Hollow Knight's popularity among gamers and developers alike is its open-source nature. The game's source code is available on GitHub, which has led to the creation of various mods, tweaks, and even unofficial ports to other platforms. For iOS enthusiasts, one of the most sought-after requests has been to play Hollow Knight on their devices. This led to the development of Hollow Knight IPA, a version of the game tailored for iOS devices.