It works!!! These 1Up Cards revived my games, ALL OF THEM!! There’s glitches in the games but that was because these games went through 3 decades of being stored in an North Eastern Attic. HOT, COLD, HOT, COLD, HOT, COLD (summers, winters). Yet these cards with the Cleaner (99.9% propyl alcohol) cleaned all the grim away, ALL OF IT!!! I put the non working games in the NES (after cleaning the NES with the 1Up Cartridge of course) and Walla! Everything was and still is up and operational! I should also mention I had to buy the 1Up Cartridge Cleaner that cleans off the 72 pin connector inside the NES, because the NES was right with the games in my non Temperature Controlled Attic. These games turn on right away even the ones I couldn’t get to work when I was a kid, I KNEW NOT TO THROW AWAY THE NON WORKING GAMES ALL THEM YEARS BACK! Now, it’s time to kill that Mother Brain!!!