Well I just owned the second and third kings. I really liked the unique style of beating the third one (the fat one who eats the sweets). Now I'm kinda stuck in limbo for awhile though, since I really don't think I'm ready for the fourth king and I've done so many of the side quests already I've earned enough money to buy every upgrade available to me thus far. Anyone know how far along you go before you get the miners? I keep running into those damn boulders everywhere blocking my way.