This emulator is incredibly slow. Out of all the games I tried, none of them run at full speed.
Alternative for Nintendo stuff:
I would recommend Delta for retro Nintendo roms of many varieties.
Alternative for Master System:
If you want to play Master System roms on your phone, I would recommend using Eclipse. It’s not on ADBoy Store, but you can install it for offline play using the “Add to Home Screen” function in Safari. If you want to play. Master system games don’t always play sound on Eclipse, but that’s better than the sound This thing puts out! If you need sound in your Master System games, you can use a tool for PC to convert them to GBA format and run them in the “GBA” section in Delta, though these may drain the battery slightly faster due to the use of a nested emulator.