Do not open the game yet. Using a file manager (like ZArchiver), move the .obb file into: Internal Storage/Android/obb/com.sonic.megamix/ If the folder doesn't exist, create it.
Go to your Android Settings > Security > Enable "Install from Unknown Sources" for your browser or file manager. sonic megamix mania download android upd
Sega and Sonic the Hedgehog are registered trademarks. This article is for educational purposes. Download fan games responsibly. Do not open the game yet