This is probably the best emulator I've tried for android. It runs smoothly, with no lag at all. With all the ROMs I've tried, only two didn't work. Zelda legend of Link, a ROM hack that can only work on certain emulators, and Super Mario Bros 2 FDS, but this is the only NES emulator on android I've seen that has a FDS option, and I may have a bad ROM. The only thing I wish it had was a way to disable pixel smoothing. Anyways, This is by far the best NES emulator on Android and definitely deserves a download.