Apps like Pixel Studio or Draw Pixel are great for mobile sprite editing.
Making a Sonic 3 AIR mod for iOS is more involved than on PC, but the file sharing method makes iterative testing surprisingly smooth. Start with simple sprite swaps, master the mod.json structure, then move up to audio and scripts. Always keep a backup of your original IPA, and test on both an iPhone and iPad (touch controls differ). how to make a sonic 3 air mod on ios
Use the native Files app or a third-party app like ZArchiver to move and rename files. Apps like Pixel Studio or Draw Pixel are