So far, most of them work fine. I beat Soul Blazer without any issues but ActRaiser and Aladdin only run at 75% of speed. I didn't inject these myself, I got them from another website and SMAS+SMW was also one that ran slow, but I replaced it with one that runs at 100% speed. So far, I have SNES, N64, GBA, and DS games. I don't have any NES or TG-16 games.