The decompilation does not include the game assets (graphics, music, levels). You must provide your own legally obtained game files from Steam or a console.
This is the gray area. The itself is not illegal—it is a re-implementation of the engine. However, downloading the Data.rsdk from a torrent or sharing it is copyright infringement. Sonic Mania Android Apk Download Game Jolt LINK
About the APK on Game Jolt Game Jolt is a community-driven platform that hosts indie games and developer-published builds. Some creators or fans may upload Android APK builds or installer packages there. If you find a Sonic Mania APK on Game Jolt, consider these points before downloading: The decompilation does not include the game assets
The developers behind these ports have done an impressive job optimizing the UI for touchscreens. While nothing beats a physical controller (and the game supports Bluetooth controllers flawlessly), the on-screen virtual buttons are customizable in size and position. The itself is not illegal—it is a re-implementation
: Technical guides are available on GitHub, such as the MisterSheeple Android Build Guide , which uses the original game assets to run the engine natively on Android .