Hollow Knight was never officially ported to iOS by Team Cherry. However, due to the game being built in Unity, dedicated fans have successfully ported the game to mobile devices. These "fan ports" are distributed as IPA files, which are the iOS equivalent of an Android APK or a Windows EXE.
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Open AltStore, navigate to the tab, and tap the "+" icon in the top-left corner. Hollow Knight was never officially ported to iOS
In the deepest reaches of the Ancient Basin, where the Void clings to the stones like damp velvet, there sits a forgotten brewery. It isn't run by the Pale King, but by a rogue sibling who traded their nail for a mash tun. What specific iOS are you currently using