Having played Adventure Island as a kid, the first one was a blast. Not that great game, but still a fond memory of the past. However, Monster Land was absolutely atrocious to play. Terrible mechanics, unfair enemy placements at times and stupid bosses. The third and fourth one were OK... Still, if you haven't played those games and want to, wait for a sale. Otherwise, check the newer titles. They are so much better. I don't get why they have to make the bosses and stages harder than the original. What's the point?