: On older Android devices, you may need to move your ROM files from the "Downloads" folder to a custom-created "Games" folder due to file access restrictions.
If you don't want to use a standalone emulator, some specialized apps act as all-in-one launchers: Mario Game For Android 4.0.4
: Some users recommend downloading the Happy Chick APK via Chrome to find and install classic versions of Super Mario Bros or Super Mario Bros 3 that work offline. : On older Android devices, you may need