I have been downloading tons of roms. I have like 83+ NES Games. Some of these run preety good with choppy sound, some run perfectly, while others either run slowly or don't even load at all. Here is a list of games that should run smoothly on this emu as of right now! American Gladiators Balloon Fight Baseball Blaster Master Cabal Clu Clu Land Contra Donkey Kong 3 Donkey Kong Dr. Mario Galaga Golf Gyromite Adventure Island 1, 2, and 3 Ice Climber Kirby's Adventure Kung Fu Legend of Zelda M.C. Kids Mach Rider Mario Bros. Megaman (I haven't tested the others on there yet.) NES Test Cart (ROM) Ninja Gaiden (Haven't tested 2 and 3) Another NES test cart Pac-Man Paperboy Pinball Rad Racer Skate or Die 1, and 2 Super Mario Bros. 2 Lost Levels Super Mario/Duck Hunt Super Mario Bros. (RUNS BETTER THAN THE OTHER) Tennis Tetris Wario's woods Wrecking Crew Yoshi Most of these games run pretty smoothly. PLEASE NOTE: This is not a list of working GAMES, It's only a list of the games that SHOULD run good. Note 2: Games may or may not be the same on your 3DS.