Avoid websites promising "100MB Naruto Mugen APK only" (no data folder). They are likely malware. The APK is just the engine; the 100MB is the game data.
Go to your Android device's Settings > Security and toggle on "Install from Unknown Sources".
: While technically a different engine, many "100MB Naruto" searches lead to Senki mods, which offer a 2D MOBA-style experience with Mugen-like character designs. Naruto vs Bleach (Lite)
By following this guide, you should be able to download and install Naruto Mugen Apk 100mb with ease. If you encounter any issues or have questions, feel free to leave a comment below.
: Look for reputable community sources or dedicated M.U.G.E.N repositories like Enable Unknown Sources
