Sega Genesis (Mega Drive) games are typically distributed as .bin (binary) files. A .bin file is a raw, sector-by-sector copy of the game cartridge’s read-only memory (ROM). Common examples include sonic3.bin (Sonic 3 alone) and sonic2.bin (Sonic 2).
If you found instructions telling you to place a sonic3.bin file into a specific system folder on Android (often related to the Android port of Sonic 3 or a specific emulator): sonic knuckles wsonic3bin file install
Thanks to AltStore and sideloading, iOS emulation is viable. Sega Genesis (Mega Drive) games are typically distributed as
If you use RetroArch, wsonic3.bin is supported by RetroAchievements. You must: If you use RetroArch, wsonic3