Use Git to clone the Sonic Mania Decompilation repository recursively to include all necessary submodules . Building the APK
At first glance, decompiling a commercially available game seems redundant. Sonic Mania Plus runs perfectly on modern Android devices via the Google Play Store. Why tear it apart? The answer lies in longevity and ownership. Unlike the Sega Genesis ROMs of the 1990s, which can be emulated indefinitely, modern Android games depend on a fragile ecosystem: OS updates break 32-bit binaries, OEMs drop support for older APIs, and storefronts eventually delist titles. When a game’s source code is locked in a corporate vault—as it is with Sega—any future port, bug fix, or compatibility patch is impossible without re-licensing or renegotiation. Decompilation bypasses this by reconstructing a buildable source tree from the final executable.
: The decomp includes a built-in mod loader . This enables features like custom characters (such as Amy Rose) and new level layouts that are not available in official versions.
To understand the Android excitement, we have to look at the PC scene.