Modifying Arcade Classics: What if Galaga played Gaplus if you put in the Pac-Man code?

Today, I’m showing a video where if you entered the Pac-Man code in Ms. Pac-Man/Galaga, it would modify Galaga as well, and replace Galaga with Gaplus (this is imaginary, because I merged the videos). Note: Credit to ‪@oldclassicgame‬ for the video.