For me, the CD version plays exactly the same as the cartridge. It does not seem harder to score. I do not notice the frame rate differences. The sound is way better and was super cool to play for the first time after playing the cartridge version for 20 odd years. The extra video is hilariously terrible. Ron Barr has a great intro for every game now with cool audio. Was just a little harder to set up on the emulator, but totally worth it! Showed my brother and he wasn't impressed with the difference though, lol