Great game, amazing port. I've encountered maybe 2 wall glitches, but that is literally it for my bad experiences. However, I must rate 3 stars at max because I had paid for the ad free version and up until now it had booted from startup to gameplay with no ads. Now, I receive an ad for other Sega games when entering the main menu. I did not need to pay money for the ad free experience but now, after a great amount of time has passed since purchased, I get them. Why?